For n > 5, a(n) = 15*a(n-1) - 15*a(n-2) + a(n-3); initial terms are 1, 3, 8, 120, 1680.
A051047
For n > 5, a(n) = 15*a(n-1) - 15*a(n-2) + a(n-3); initial terms are 1, 3, 8, 120, 1680.
Terms
- a(0) =1a(1) =3a(2) =8a(3) =120a(4) =1680a(5) =23408a(6) =326040a(7) =4541160a(8) =63250208a(9) =880961760a(10) =12270214440a(11) =170902040408
External references
- oeis: A051047