Column 3 of triangle A136220; also equals column 0 of U^4 where U = A136228.

A136224

Column 3 of triangle A136220; also equals column 0 of U^4 where U = A136228.

Terms

    a(0) =1a(1) =4a(2) =36a(3) =442a(4) =6742a(5) =122350a(6) =2571620a(7) =61426282a(8) =1643616044a(9) =48708655760

External references