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
- oeis: A089507