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Search: id:A152965
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| A152965 |
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Twice 12-gonal numbers: 2n(5n-4). |
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+0
2
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| 0, 2, 24, 66, 128, 210, 312, 434, 576, 738, 920, 1122, 1344, 1586, 1848, 2130, 2432, 2754, 3096, 3458, 3840, 4242, 4664, 5106, 5568, 6050, 6552, 7074, 7616, 8178, 8760, 9362, 9984, 10626, 11288, 11970, 12672, 13394, 14136, 14898, 15680
(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) = 10n^2 - 8n = A051624(n)*2.
a(n)=20*n+a(n-1)-38 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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EXAMPLE
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For n=2, a(2)=20*2+0-38=2; n=3, a(3)=20*3+2-38=24; n=4, a(4)=20*4+24-38=66 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 2, 6!, 20}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 02 2009]
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CROSSREFS
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Cf. A051624.
Sequence in context: A079608 A068878 A100918 this_sequence A139284 A003614 A119060
Adjacent sequences: A152962 A152963 A152964 this_sequence A152966 A152967 A152968
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Dec 21 2008
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