Expansion of (1-x^2*c(x)^4)/(1-4*x*c(x)^2), c(x) the g.f. of A000108.
A158197
Expansion of (1-x^2*c(x)^4)/(1-4*x*c(x)^2), c(x) the g.f. of A000108.
Terms
- a(0) =1a(1) =4a(2) =23a(3) =140a(4) =866a(5) =5388a(6) =33603a(7) =209796a(8) =1310510a(9) =8188328a(10) =51169094a(11) =319779544a(12) =1998527188a(13) =12490460620a(14) =78064190235a(15) =487896926580
External references
- oeis: A158197