G.f. satisfies A(x) = ( 1 + x*A(x)^2 * (1 + x) )^2.
A371577
G.f. satisfies A(x) = ( 1 + x*A(x)^2 * (1 + x) )^2.
Terms
- a(0) =1a(1) =2a(2) =11a(3) =70a(4) =505a(5) =3910a(6) =31772a(7) =267280a(8) =2307982a(9) =20339946a(10) =182207333a(11) =1654250474a(12) =15187764411a(13) =140767293560
External references
- oeis: A371577