A089448 Diagonal of square table A089447, which lists the coefficients of x^n*y^k in f(x,y) that satisfies: f(x,y) = g(x,y) + xy*f(x,y)^4 and where g(x,y) satisfies: 1 + (x+y-1)*g(x,y) + xy*g(x,y)^2 = 0.
1, 4, 48, 841, 18004, 435654, 11427992, 317112363, 9167951752, 273436829602, 8357069773840, 260498528992976, 8252868865615952, 265043778330385821, 8611226621063270068, 282587565659572959007, 9354553949064125991864
Offset: 0