G.f. A(x) satisfies 1 + 4*A(x) = Sum_{n>=0} (x + 3*A(x)^n)^n.
A380063
G.f. A(x) satisfies 1 + 4*A(x) = Sum_{n>=0} (x + 3*A(x)^n)^n.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =22a(4) =136a(5) =682a(6) =4030a(7) =23539a(8) =143026a(9) =883696a(10) =5546230a(11) =35293039a(12) =226922620a(13) =1473059344a(14) =9637454320a(15) =63493041340a(16) =420841313770
External references
- oeis: A380063