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Search: id:A153794
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| A153794 |
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4 times octagonal numbers: 4n(3n-2). |
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+0
3
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| 0, 4, 32, 84, 160, 260, 384, 532, 704, 900, 1120, 1364, 1632, 1924, 2240, 2580, 2944, 3332, 3744, 4180, 4640, 5124, 5632, 6164, 6720, 7300, 7904, 8532, 9184, 9860, 10560, 11284, 12032, 12804, 13600, 14420, 15264, 16132, 17024
(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) = 12n^2 - 8n = A000567(n)*4 = A139267(n)*2.
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MATHEMATICA
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s=0; lst={s}; Do[s+=n; AppendTo[lst, s], {n, 4, 7!, 24}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 02 2009]
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CROSSREFS
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Cf. A000567, A139267, A152751, A153808.
Sequence in context: A138340 A113250 A012036 this_sequence A108914 A052469 A033430
Adjacent sequences: A153791 A153792 A153793 this_sequence A153795 A153796 A153797
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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), Jan 19 2009
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