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Search: id:A116989
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| 1, 925, 1135716, 593223373, 130220375812, 14195655302684, 893936543319276, 36397263567477054, 1025115791220794876, 21899052879460199956, 372805053916689840596, 5076066733212581886566, 57875038239259949679248
(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) = SUM[d|n] d*(d+1)*(d+2)*(d+3)*(d+4)*(d+5)/720. a(n) = SUM[d|n] C(d,6). a(n) = SUM[d|n] A000579(d). a(n) = SUM[d|n] (1/720)d^6+(1/48)d^5+(17/144)d^4+(5/16)d^3+(137/360)d^2+(1/6)d.
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CROSSREFS
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See also: A007437 = inverse Moebius transform of triangular numbers, A116963 = inverse Moebius transform of tetrahedral numbers. Cf. A073570, A101289.
Cf. A000389, A000579, A007437, A116963, A101289.
Sequence in context: A140906 A115696 A066741 this_sequence A099688 A074889 A109184
Adjacent sequences: A116986 A116987 A116988 this_sequence A116990 A116991 A116992
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost2(AT)yahoo.com), Apr 02 2006
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