G.f. A(x) satisfies: A(x) = (1 + x*A(x))*(1 + 2*x*A(x)) / (1 - x*A(x))^2.
A341961
G.f. A(x) satisfies: A(x) = (1 + x*A(x))*(1 + 2*x*A(x)) / (1 - x*A(x))^2.
Terms
- a(0) =1a(1) =5a(2) =36a(3) =307a(4) =2880a(5) =28714a(6) =298620a(7) =3203183a(8) =35181792a(9) =393697030a(10) =4472679816a(11) =51450807390a(12) =598090673232
External references
- oeis: A341961