a(1) = 1, a(2) = 5, a(n+2) = 5*a(n+1) + (n + 1)^2*a(n).
A142980
a(1) = 1, a(2) = 5, a(n+2) = 5*a(n+1) + (n + 1)^2*a(n).
Terms
- a(0) =1a(1) =5a(2) =29a(3) =190a(4) =1414a(5) =11820a(6) =110004a(7) =1129200a(8) =12686256a(9) =154896480a(10) =2043108000a(11) =28958014080a(12) =438997622400
External references
- oeis: A142980