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Search: id:A135706
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| 0, 2, 14, 36, 68, 110, 162, 224, 296, 378, 470, 572, 684, 806, 938, 1080, 1232, 1394, 1566, 1748, 1940, 2142, 2354, 2576, 2808, 3050, 3302, 3564, 3836, 4118, 4410, 4712, 5024, 5346, 5678, 6020, 6372, 6734, 7106, 7488, 7880, 8282, 8694, 9116, 9548, 9990, 10442
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Twice heptagonal numbers. - Omar E. Pol (info(AT)polprimos.com), May 14 2008
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REFERENCES
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L. Hogben, Choice and Chance by Cardpack and Chessboard. Vol. 1, Chanticleer Press, NY, 1950, p. 36.
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FORMULA
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Binomial transform of [2, 12, 10, 0, 0, 0,...] - Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 05 2008
a(n)=10*n+a(n-1)-18 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
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EXAMPLE
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For n=2, a(2)=10*2+0-18=2; n=3, a(3)=10*3+2-18=14; n=4, a(4)=10*4+14-18=36 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 2, 6!, 10}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 02 2009]
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CROSSREFS
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a(n)=A000566(n)*2. - Omar E. Pol (info(AT)polprimos.com), May 14 2008
Sequence in context: A128126 A134647 A004117 this_sequence A091520 A108597 A062548
Adjacent sequences: A135703 A135704 A135705 this_sequence A135707 A135708 A135709
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mar 04 2008, Mar 05 2008
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