69106897225domain: NAppears in sequencesCentered cube numbers: (n+1)^18 + n^18.at n=3A036096a(n) = 3^n + 4^n.at n=18A074605G.f.: (2-x)/((1+3x)(1-4x)); e.g.f.: exp(4x) + exp(-3x); a(n) = 4^n + (-3)^n.at n=18A087452