a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/5)} binomial(n,5*k+1) * a(n-5*k-1).
A352430
a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/5)} binomial(n,5*k+1) * a(n-5*k-1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =721a(7) =5054a(8) =40488a(9) =364896a(10) =3654000a(11) =40249441a(12) =483659508a(13) =6296246424a(14) =88269037584
External references
- oeis: A352430