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Search: id:A152760
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| A152760 |
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4 times 9-gonal numbers: 2n(7n-5). |
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+0
1
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| 0, 4, 36, 96, 184, 300, 444, 616, 816, 1044, 1300, 1584, 1896, 2236, 2604, 3000, 3424, 3876, 4356, 4864, 5400, 5964, 6556, 7176, 7824, 8500, 9204, 9936, 10696, 11484, 12300, 13144, 14016, 14916, 15844, 16800, 17784, 18796, 19836
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = 14n^2 - 10n = A001106(n)*4 = A139268(n)*2.
a(n)=28*n+a(n-1)-52 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 14 2009]
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EXAMPLE
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For n=2, a(2)=28*2+0-52=4; n=3. a(3)=28*3+4-52=36; n=4, a(4)=28*4+36-52=96 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 14 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 4, 8!, 28}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 02 2009]
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CROSSREFS
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Cf. A001106, A139268, A152759.
Sequence in context: A167632 A072157 A075215 this_sequence A016826 A038688 A076830
Adjacent sequences: A152757 A152758 A152759 this_sequence A152761 A152762 A152763
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KEYWORD
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easy,nonn,new
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Dec 14 2008
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