a(n) = (n+1)!*Sum_{k=0..(n-1)/2}(k!*stirling1(n-k,k+1)*(-1)^(n+1)/(n-k)!/(k+1)!).

A270707

a(n) = (n+1)!*Sum_{k=0..(n-1)/2}(k!*stirling1(n-k,k+1)*(-1)^(n+1)/(n-k)!/(k+1)!).

Terms

    a(0) =0a(1) =2a(2) =3a(3) =14a(4) =60a(5) =349a(6) =2310a(7) =17772a(8) =154224a(9) =1494168a(10) =15973980a(11) =186815386a(12) =2372249880a(13) =32503673760a(14) =477955820160

External references