Second column of triangle A089504 and second column of array A078741 divided by 18.

A089507

Second column of triangle A089504 and second column of array A078741 divided by 18.

Terms

    a(0) =1a(1) =30a(2) =756a(3) =18360a(4) =441936a(5) =10614240a(6) =254788416a(7) =6115201920a(8) =146766525696

External references