A061834 a(n) = binomial(n,2) * !n.

0, 0, 2, 12, 60, 340, 2310, 18354, 165592, 1664424, 18410130, 222085270, 2901011124, 40790592492, 614247917374, 9862468172970, 168192316357680, 3036117383306704, 57835808554908042, 1159445925005561694, 24400842327684259660, 537878773763482265940

Offset

0,3

References

See A003422 for !n.

Links

Harry J. Smith, Table of n, a(n) for n = 0..200

Index entries for sequences related to final digits of numbers

Prog

(PARI) { f=1; L=0; for (n=0, 200, if (n, L+=f; f*=n); write("b061834.txt", n, " ", L*binomial(n, 2)) ) } \\ Harry J. Smith, Jul 28 2009

Crossrefs

Cf. A003422.

Sequence in context: A038154 A357661 A371399 * A364283 A360590 A362244

Adjacent sequences: A061831 A061832 A061833 * A061835 A061836 A061837

Keyword

nonn

Author

N. J. A. Sloane, Nov 10 2001

Status

approved