-941664domain: ZAppears in sequencesExpansion of g.f. (1+x)*(3+x)/(1+6*x^2+x^4).at n=15A100434List of triples (r,s,t): the matrix M = [[1,4,4][1,3,2][1,2,1]] is raised to successive negative powers, then (r,s,t) are the square roots of M[3,1], M[1,1], M[1,3] respectively.at n=45A249577