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A078504 a(n) = binomial(sigma(n+1), sigma(n)). 0
3, 4, 35, 0, 924, 0, 6435, 0, 8568, 0, 30421755, 0, 1961256, 1, 2629575, 0, 62359143990, 0, 513791607420, 0, 58905, 0, 36052387482172425, 0, 4280561376, 0, 41648951840265, 0, 164307576757973059488, 0, 916312070471295267, 0, 25827165 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Table[Binomial[DivisorSigma[1, i + 1], DivisorSigma[1, i]], {i, 1, 50}]
CROSSREFS
Cf. A000203.
Sequence in context: A032834 A025140 A246015 * A066090 A251259 A042891
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Jan 05 2003
STATUS
approved

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Last modified February 24 14:43 EST 2024. Contains 370305 sequences. (Running on oeis4.)