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Search: id:A054556
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| 1, 4, 15, 34, 61, 96, 139, 190, 249, 316, 391, 474, 565, 664, 771, 886, 1009, 1140, 1279, 1426, 1581, 1744, 1915, 2094, 2281, 2476, 2679, 2890, 3109, 3336, 3571, 3814, 4065, 4324, 4591, 4866, 5149, 5440, 5739, 6046, 6361, 6684, 7015, 7354, 7701, 8056
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Move in 1-4 direction in a spiral organized like A068225 etc.
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FORMULA
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Equals binomial transform of [1, 3, 8, 0, 0, 0,...] - Gary W. Adamson (qntmpkt(AT)yahoo.com), Apr 30 2008
a(n)=8*n+a(n-1)-13 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 09 2009]
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EXAMPLE
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For n=2, a(2)=8*2+1-13=4; n=3, a(3)=8*3+4-13=15; n=4, a(4)=8*4+15-13=34 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 09 2009]
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MATHEMATICA
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lst={}; Do[p=4*n^2-9*n+6; AppendTo[lst, p], {n, 1, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 01 2008]
...and/or... s=1; lst={s}; Do[s+=n+1; AppendTo[lst, s], {n, 2, 6!, 8}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 25 2008]
s = 1; lst = {s}; Do[s += n + 2; AppendTo[lst, s], {n, 1, 360, 8}]; lst [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 11 2009]
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CROSSREFS
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Cf. A054555, A068225, A054552, A054554, A054567, A054569, A033951.
Sequence in context: A120389 A163490 A124150 this_sequence A113693 A077414 A015653
Adjacent sequences: A054553 A054554 A054555 this_sequence A054557 A054558 A054559
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KEYWORD
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easy,nonn,new
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AUTHOR
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Enoch Haga, G. L. Honaker, Jr. (Enokh(AT)comcast.net), Apr 10 2000
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EXTENSIONS
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Edited by Frank Ellermann, Feb 24 2002
Incorrect formula deleted by N. J. A. Sloane, Aug 02 2009
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