Expansion of e.g.f. (1-2*x)/(1-4*x+2*x^2).
A052680
Expansion of e.g.f. (1-2*x)/(1-4*x+2*x^2).
Terms
- a(0) =1a(1) =2a(2) =12a(3) =120a(4) =1632a(5) =27840a(6) =570240a(7) =13628160a(8) =372234240a(9) =11437977600a(10) =390516940800
External references
- oeis: A052680