Triangle where g.f. D = D(x,m) and related series S = S(x,m) and C = C(x,m) satisfy S = x*C*D, C = 1 + x*S*D, and D = 1 + m*x*S*C, as read by rows of coefficients T(n,k) of x^(2*n)*m^k in C(x,m) for n>=1, k=0..n.
A278882
Triangle where g.f. D = D(x,m) and related series S = S(x,m) and C = C(x,m) satisfy S = x*C*D, C = 1 + x*S*D, and D = 1 + m*x*S*C, as read by rows of coefficients T(n,k) of x^(2*n)*m^k in C(x,m) for n>=1, k=0..n.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =0a(7) =3a(8) =8a(9) =1a(10) =0a(11) =4a(12) =30a(13) =20a(14) =1a(15) =0a(16) =5a(17) =80a(18) =147a(19) =40a(20) =1a(21) =0a(22) =6a(23) =175a(24) =672a(25) =504a(26) =70a(27) =1a(28) =0a(29) =7
External references
- oeis: A278882