876173328384domain: NAppears in sequences4-fold convolution of A000302 (powers of 4); expansion of g.f. 1/(1-4*x)^4.at n=15A0388463n(n-1)4^(n-2).at n=17A129532Denominators of mass formula for connected vacuum graphs on 2n nodes for a phi^3 field theory.at n=17A226261