Obverse convolution A000032**A000032; see Comments.

A374850

Obverse convolution A000032**A000032; see Comments.

Terms

    a(0) =4a(1) =9a(2) =50a(3) =576a(4) =12150a(5) =529984a(6) =46080000a(7) =8227578436

External references