A099198 A bisection of A002807.

0, 7, 197, 8018, 556014, 59740609, 9174170011, 1904975488436, 513771331467372, 174548332364311563, 72920994844093191553, 36737130036755448717350, 21961934137099746053158010, 15369599839081193169161637861

Offset: 1

Author

Lambert Klasen (Lambert.Klasen(AT)gmx.net), Nov 16 2004

Keywords

• nonn

Crossrefs

Cf. A002807.

Programs

PARI

forstep(n=2,40,2,s=0;for(k=3,n,s+=(k-1)!*binomial(n,k)/2);print1(s,", "))