4,2

For n>5, a(n) = (n^4-18n^3+143n^2-486n+672)/24.

Sequence in context: A121291 A097984 A028347 this_sequence A131976 A074376 A134340

Adjacent sequences: A038791 A038792 A038793 this_sequence A038795 A038796 A038797

nonn

Clark Kimberling (ck6(AT)evansville.edu), May 02 2000