a(n) = (n+1)!*Sum_{k=0..(n-1)/2}((k)!*stirling2(n-k,k+1)/(n-k)!/(k+1)).

A270367

a(n) = (n+1)!*Sum_{k=0..(n-1)/2}((k)!*stirling2(n-k,k+1)/(n-k)!/(k+1)).

Terms

    a(0) =0a(1) =2a(2) =3a(3) =10a(4) =35a(5) =191a(6) =1162a(7) =8996a(8) =77877a(9) =786757a(10) =8801276a(11) =110180038a(12) =1508049127a(13) =22568091079a(14) =364984569510

External references