a(n) = n*(3*n+1)*(n+2)!/24.
A037960
a(n) = n*(3*n+1)*(n+2)!/24.
Terms
- a(0) =0a(1) =1a(2) =14a(3) =150a(4) =1560a(5) =16800a(6) =191520a(7) =2328480a(8) =30240000a(9) =419126400a(10) =6187104000a(11) =97037740800
External references
- oeis: A037960
A037960
a(n) = n*(3*n+1)*(n+2)!/24.