E.g.f. x*(1-2*x-2*x^2-sqrt(1-4*x-4*x^2))/ (2*(1+x)^2).
A052744
E.g.f. x*(1-2*x-2*x^2-sqrt(1-4*x-4*x^2))/ (2*(1+x)^2).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =6a(4) =48a(5) =840a(6) =17280a(7) =448560a(8) =13789440a(9) =491702400a(10) =19929369600a(11) =904873939200
External references
- oeis: A052744