E.g.f. 1/((1-2x)(1-x)^2).
A052650
E.g.f. 1/((1-2x)(1-x)^2).
Terms
- a(0) =1a(1) =4a(2) =22a(3) =156a(4) =1368a(5) =14400a(6) =177840a(7) =2530080a(8) =40844160a(9) =738823680a(10) =14816390400a(11) =326439590400
External references
- oeis: A052650
A052650
E.g.f. 1/((1-2x)(1-x)^2).