a(n) = n^2*(n+1)*(n+3)!/48.
A037961
a(n) = n^2*(n+1)*(n+3)!/48.
Terms
- a(0) =0a(1) =1a(2) =30a(3) =540a(4) =8400a(5) =126000a(6) =1905120a(7) =29635200a(8) =479001600a(9) =8083152000a(10) =142702560000
External references
- oeis: A037961
A037961
a(n) = n^2*(n+1)*(n+3)!/48.