G.f. A(x,y) satisfies: A( x - x*y*A(x,y), y) = x + x*(1-y)*A(x,y), where the coefficients T(n,k) of x^n*y^k form a triangle read by rows n>=1, for k=0..n-1.
A291820
G.f. A(x,y) satisfies: A( x - x*y*A(x,y), y) = x + x*(1-y)*A(x,y), where the coefficients T(n,k) of x^n*y^k form a triangle read by rows n>=1, for k=0..n-1.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =0a(6) =1a(7) =7a(8) =5a(9) =0a(10) =1a(11) =16a(12) =38a(13) =14a(14) =0a(15) =1a(16) =30a(17) =157a(18) =189a(19) =42a(20) =0a(21) =1a(22) =50a(23) =477a(24) =1245a(25) =904a(26) =132a(27) =0a(28) =1a(29) =77
External references
- oeis: A291820