Main diagonal of square array A130462.

Terms

a(0) =1a(1) =2a(2) =12a(3) =83a(4) =617a(5) =4759a(6) =37649a(7) =303372a(8) =2480181a(9) =20518329a(10) =171457967a(11) =1445229218a(12) =12274844031a(13) =104959302925a(14) =902902513636