Row sums in A112668.

Terms

a(0) =1a(1) =4a(2) =21a(3) =40a(4) =1555a(5) =3906a(6) =299593a(7) =3280a(8) =87381a(9) =435848050a(10) =67546215517a(11) =61035156a(15) =21523360a(17) =953674316406a(19) =1743392200