G.f. satisfies A(x) = (1 + x*A(x))^2 * (1 + x*A(x)^2).
A274734
G.f. satisfies A(x) = (1 + x*A(x))^2 * (1 + x*A(x)^2).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =94a(4) =661a(5) =4983a(6) =39363a(7) =321587a(8) =2694860a(9) =23035341a(10) =200068651a(11) =1760558682a(12) =15663027711a(13) =140648129383
External references
- oeis: A274734