a(1) = 1, a(2) = 4, a(n+2) = 4*a(n+1) + (n + 1)*(n + 2)*a(n).
A142984
a(1) = 1, a(2) = 4, a(n+2) = 4*a(n+1) + (n + 1)*(n + 2)*a(n).
Terms
- a(0) =1a(1) =4a(2) =22a(3) =136a(4) =984a(5) =8016a(6) =73392a(7) =742464a(8) =8254080a(9) =99838080a(10) =1307301120a(11) =18407831040a(12) =277570298880
External references
- oeis: A142984