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Search: id:A139115
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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
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OFFSET
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1,1
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FORMULA
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a(n)=A000043(n)*(A000043(n)-1).
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CROSSREFS
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Cf. A000043, A036689, A139306, A139307, A139116, A139223, A139224, A139225, A139226.
Sequence in context: A087150 A087134 A036689 this_sequence A121128 A056820 A027558
Adjacent sequences: A139112 A139113 A139114 this_sequence A139116 A139117 A139118
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 10 2008
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Search completed in 0.002 seconds
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