Diagonal sums of the exponential Riordan array [1+x*arctanh(x), x], A166357.

A166359

Diagonal sums of the exponential Riordan array [1+x*arctanh(x), x], A166357.

Terms

    a(0) =1a(1) =3a(2) =15a(3) =197a(4) =6909a(5) =459383a(6) =48252699a(7) =7299708105

External references