a(0) = 1; a(n) = 4 * n * a(n-1) + Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).
A343687
a(0) = 1; a(n) = 4 * n * a(n-1) + Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).
Terms
- a(0) =1a(1) =5a(2) =51a(3) =782a(4) =15992a(5) =408814a(6) =12541010a(7) =448834728a(8) =18358297416a(9) =844755218400
External references
- oeis: A343687