G.f. satisfies: A(x) = Sum_{n>=0} x^n*[Sum_{k=0..n} C(n,k)^2 *x^k* A(x)^(2k)].
A183876
G.f. satisfies: A(x) = Sum_{n>=0} x^n*[Sum_{k=0..n} C(n,k)^2 *x^k* A(x)^(2k)].
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =24a(5) =86a(6) =328a(7) =1289a(8) =5180a(9) =21232a(10) =88384a(11) =372582a(12) =1587442a(13) =6825092a(14) =29573380a(15) =129014039a(16) =566183860a(17) =2497841196a(18) =11071594936a(19) =49281430216a(20) =220193658876a(21) =987234942328
External references
- oeis: A183876