O.g.f. satisfies A^5(z) = 1/(1 - z)*( BINOMIAL(BINOMIAL(A(z))) )^4.
A258380
O.g.f. satisfies A^5(z) = 1/(1 - z)*( BINOMIAL(BINOMIAL(A(z))) )^4.
Terms
- a(0) =1a(1) =9a(2) =121a(3) =2289a(4) =58561a(5) =1954281a(6) =82055449a(7) =4190913201a(8) =252934661569
External references
- oeis: A258380