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A100504
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(4n^3 + 6n^2 + 8n + 6)/3.
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2
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2, 8, 26, 64, 130, 232, 378, 576, 834, 1160, 1562, 2048, 2626, 3304, 4090, 4992, 6018, 7176, 8474, 9920, 11522, 13288, 15226, 17344, 19650, 22152, 24858, 27776, 30914, 34280, 37882, 41728, 45826, 50184, 54810, 59712, 64898, 70376, 76154, 82240
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Bisection of A000125.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (4,-6,4,-1).
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FORMULA
| a(n) = a(n-1) + (2*n)^2 + 2. - DELEHAM Philippe, Jan 18 2012
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PROG
| (PARI) a(n)=n*(4*n^2+6*n+8)/3+2 \\ Charles R Greathouse IV, Jan 18 2012
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CROSSREFS
| Sequence in context: A195585 A102942 A206803 * A099416 A101696 A155861
Adjacent sequences: A100501 A100502 A100503 * A100505 A100506 A100507
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 24 2004
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EXTENSIONS
| More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Nov 25 2004
New name based on formula from Ralf Stephan.
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