Expansion of g.f. A(x,y) satisfying A(x,y) = 1 + x*A(x,y)/(1 - x*y * A(x,y))^2, as a triangle of coefficients T(n,k) of x^n*y^k in A(x,y), read by rows n >= 0.
A365770
Expansion of g.f. A(x,y) satisfying A(x,y) = 1 + x*A(x,y)/(1 - x*y * A(x,y))^2, as a triangle of coefficients T(n,k) of x^n*y^k in A(x,y), read by rows n >= 0.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =0a(6) =1a(7) =6a(8) =3a(9) =0a(10) =1a(11) =12a(12) =20a(13) =4a(14) =0a(15) =1a(16) =20a(17) =70a(18) =50a(19) =5a(20) =0a(21) =1a(22) =30a(23) =180a(24) =280a(25) =105a(26) =6a(27) =0a(28) =1a(29) =42
External references
- oeis: A365770