G.f. satisfies: A(x) = (1 - 2*x*A(x))^2 * (3*A(x) - 2).
A231615
G.f. satisfies: A(x) = (1 - 2*x*A(x))^2 * (3*A(x) - 2).
Terms
- a(0) =1a(1) =2a(2) =14a(3) =116a(4) =1068a(5) =10512a(6) =108288a(7) =1152944a(8) =12586256a(9) =140119328a(10) =1584718432a(11) =18156868096a(12) =210302739712
External references
- oeis: A231615