a(n) = [x^n] ( 1/((1 - x)^2*(1 - x^2)) )^n for n >= 1.
A352373
a(n) = [x^n] ( 1/((1 - x)^2*(1 - x^2)) )^n for n >= 1.
Terms
- a(0) =2a(1) =12a(2) =74a(3) =484a(4) =3252a(5) =22260a(6) =154352a(7) =1080612a(8) =7621526a(9) =54071512a(10) =385454940a(11) =2758690636a(12) =19810063392a(13) =142662737376
External references
- oeis: A352373