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A099198
A bisection of A002807.
1
0, 7, 197, 8018, 556014, 59740609, 9174170011, 1904975488436, 513771331467372, 174548332364311563, 72920994844093191553, 36737130036755448717350, 21961934137099746053158010, 15369599839081193169161637861
OFFSET
1,2
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
KEYWORD
nonn
AUTHOR
Lambert Klasen (Lambert.Klasen(AT)gmx.net), Nov 16 2004
STATUS
approved