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A139115
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p(p-1), where p is A000043(n).
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4
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2, 6, 20, 42, 156, 272, 342, 930, 3660, 7832, 11342, 16002, 270920, 367842, 1634562, 4851006, 5200680, 10345872, 18083756, 19558506, 93867032, 98813540, 125720156, 397464032, 470911700, 538634472, 1979938512, 7437768806, 12210802506
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n)=A000043(n)*(A000043(n)-1).
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CROSSREFS
| Cf. A000043, A036689, A139306, A139307, A139116, A139223, A139224, A139225, A139226.
Sequence in context: A087150 A087134 A036689 * A193538 A121128 A056820
Adjacent sequences: A139112 A139113 A139114 * A139116 A139117 A139118
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KEYWORD
| nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 10 2008
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EXTENSIONS
| More terms from Vincenzo Librandi (vincenzo.librandi(AT)tin.it), May 11 2010
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