Expansion of g.f. (1 - 3*x + x^2 - sqrt(1 - 6*x + 7*x^2 - 2*x^3 + x^4))/(2*x).

A078482

Expansion of g.f. (1 - 3*x + x^2 - sqrt(1 - 6*x + 7*x^2 - 2*x^3 + x^4))/(2*x).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =6a(4) =20a(5) =70a(6) =254a(7) =948a(8) =3618a(9) =14058a(10) =55432a(11) =221262a(12) =892346a(13) =3630680a(14) =14885042a(15) =61432382a(16) =255025212a(17) =1064190214a(18) =4461325382a(19) =18780710508a(20) =79357572866a(21) =336466650450

External references