Expansion of g*(1 + x*g), where g = 1+x*g^3 is the g.f. of A001764.
A391380
Expansion of g*(1 + x*g), where g = 1+x*g^3 is the g.f. of A001764.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =19a(4) =85a(5) =416a(6) =2156a(7) =11628a(8) =64581a(9) =366850a(10) =2121405a(11) =12446655a(12) =73908588a(13) =443329264a(14) =2682282440a(15) =16350019688a(16) =100312427493a(17) =618978133158
External references
- oeis: A391380