Triangle where g.f. C = C(x,m) and related series S = S(x,m) and D = D(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>=0, k=0..n.
A278881
Triangle where g.f. C = C(x,m) and related series S = S(x,m) and D = D(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>=0, k=0..n.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =0a(6) =1a(7) =8a(8) =3a(9) =0a(10) =1a(11) =20a(12) =30a(13) =4a(14) =0a(15) =1a(16) =40a(17) =147a(18) =80a(19) =5a(20) =0a(21) =1a(22) =70a(23) =504a(24) =672a(25) =175a(26) =6a(27) =0a(28) =1a(29) =112
External references
- oeis: A278881