A099198 A bisection of A002807.

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

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Prog

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

Crossrefs

Cf. A002807.

Sequence in context: A034835 A041371 A136675 * A365988 A058391 A157388

Adjacent sequences: A099195 A099196 A099197 * A099199 A099200 A099201

Keyword

nonn

Author

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

Status

approved