Expansion of (1/(1-x^2))*c(x/((1-x)*(1-x^2))) where c(x) is the g.f. of A000108.
A188312
Expansion of (1/(1-x^2))*c(x/((1-x)*(1-x^2))) where c(x) is the g.f. of A000108.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =45a(5) =174a(6) =709a(7) =2978a(8) =12825a(9) =56303a(10) =251060a(11) =1133943a(12) =5176926a(13) =23851690a(14) =110759081a(15) =517853840a(16) =2435786531a(17) =11517940357a(18) =54722081630a(19) =261089977806
External references
- oeis: A188312