a(n) = n^1*(n+1)^2*(n+2)^3*(n+3)^4*(n+4)^5*(n+5)^6/(1!*2!*3!*4!*5!*6!).
A120409
a(n) = n^1*(n+1)^2*(n+2)^3*(n+3)^4*(n+4)^5*(n+5)^6/(1!*2!*3!*4!*5!*6!).
Terms
- a(0) =162000a(1) =26471025a(2) =1376829440a(3) =36294822144a(4) =600112800000
External references
- oeis: A120409