a(n) = r * (n-1)! where r is the rational number that satisfies the equation Sum_{k>=n} (-1)^(k + n)/C(k,n) = n*2^(n-1)*log(2) - r.

A242091

a(n) = r * (n-1)! where r is the rational number that satisfies the equation Sum_{k>=n} (-1)^(k + n)/C(k,n) = n*2^(n-1)*log(2) - r.

Terms

    a(0) =0a(1) =2a(2) =15a(3) =128a(4) =1310a(5) =15864a(6) =222936a(7) =3572736a(8) =64354608a(9) =1287495360a(10) =28328889600a(11) =679936896000

External references