Expansion of 1/(sqrt(1-4*x)*(1-3*x*c(x))), where c(x) is the g.f. of A000108.

A141223

Expansion of 1/(sqrt(1-4*x)*(1-3*x*c(x))), where c(x) is the g.f. of A000108.

Terms

    a(0) =1a(1) =5a(2) =24a(3) =113a(4) =526a(5) =2430a(6) =11166a(7) =51105a(8) =233190a(9) =1061510a(10) =4822984a(11) =21879786a(12) =99135076a(13) =448707992a(14) =2029215114a(15) =9170247393a(16) =41416383366a(17) =186957126702a(18) =843575853984

External references