Expansion of e.g.f. (1-x^2)/(1-x-2*x^2+x^4).
A052685
Expansion of e.g.f. (1-x^2)/(1-x-2*x^2+x^4).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =24a(4) =168a(5) =1680a(6) =18720a(7) =252000a(8) =3830400a(9) =65681280a(10) =1251936000a(11) =26225337600a(12) =599710003200
External references
- oeis: A052685