2764880domain: NAppears in sequencesExpansion of (1+x^4*C^2)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=13A071747Number of pairs (f,g) of endofunctions on [n] such that the composite function gf has no fixed point.at n=5A284458a(n) = (-1)^n * n! * Laguerre(n, 5*n).at n=5A332694