Expansion of (1+x^2*C^4)*C, where C = (1 - sqrt(1-4*x))/(2*x) is g.f. for Catalan numbers, A000108.

A071725

Expansion of (1+x^2*C^4)*C, where C = (1 - sqrt(1-4*x))/(2*x) is g.f. for Catalan numbers, A000108.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =10a(4) =34a(5) =117a(6) =407a(7) =1430a(8) =5070a(9) =18122a(10) =65246a(11) =236436a(12) =861764a(13) =3157325a(14) =11622015a(15) =42961470a(16) =159419670a(17) =593636670a(18) =2217608250a(19) =8308432140a(20) =31212003420a(21) =117544456770a(22) =443690433654

External references