a(n) = n!*((1 + 3n + n^2)*H(n) - n), where H(n) is the n-th harmonic number.

A129587

a(n) = n!*((1 + 3n + n^2)*H(n) - n), where H(n) is the n-th harmonic number.

Terms

    a(0) =4a(1) =29a(2) =191a(3) =1354a(4) =10634a(5) =92700a(6) =892548a(7) =9430416a(8) =108630864a(9) =1356063840a(10) =18245210400a(11) =263298142080

External references