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Search: id:A060493
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| 1, 21, 147, 627, 2002, 5278, 12138, 25194, 48279, 86779, 148005, 241605, 380016, 578956, 857956, 1240932, 1756797, 2440113, 3331783, 4479783, 5939934, 7776714, 10064110, 12886510, 16339635, 20531511, 25583481, 31631257, 38826012
(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)=n*(n + 1)*(n + 2)*(2*n + 1)*(2*n + 3)*(5*n - 1)/360; a(n)=sum(k=1, n, k^2*sum(i=1, k, i^2))=sum(k=1, n, k^2*A000330(k)) - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 20 2004
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PROGRAM
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(PARI) a(n)=n*(n + 1)*(n + 2)*(2*n + 1)*(2*n + 3)*(5*n - 1)/360
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CROSSREFS
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Cf. A036969.
Sequence in context: A107731 A003702 A101645 this_sequence A041850 A078396 A108675
Adjacent sequences: A060490 A060491 A060492 this_sequence A060494 A060495 A060496
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KEYWORD
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nonn
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AUTHOR
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Larry Reeves (larryr(AT)acm.org), Mar 20 2001
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