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 A060493 A diagonal of A036969. 1
 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; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1). FORMULA 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, Mar 20 2004 G.f.: -(4*x^3+21*x^2+14*x+1) / (x-1)^7. - Colin Barker, Dec 19 2012 PROG (PARI) a(n)=n*(n + 1)*(n + 2)*(2*n + 1)*(2*n + 3)*(5*n - 1)/360 CROSSREFS Cf. A036969. Sequence in context: A101645 A230692 A267992 * A198183 A259493 A253459 Adjacent sequences:  A060490 A060491 A060492 * A060494 A060495 A060496 KEYWORD nonn,easy AUTHOR Larry Reeves (larryr(AT)acm.org), Mar 20 2001 STATUS approved

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Last modified September 20 10:24 EDT 2020. Contains 337264 sequences. (Running on oeis4.)