627013566049domain: NAppears in sequencesExpansion of g.f. (1+8*x-x^2)/((1+x)*(1-6*x+x^2)).at n=15A105058a(n) = 6*a(n-1) - a(n-2) - 4 with n > 1, a(0)=1, a(1)=3.at n=16A182189