Expansion of g.f. (1 + 2*x)^4/((1 + x)*(1 - 16*x^2)).

Terms

a(0) =1a(1) =7a(2) =33a(3) =127a(4) =529a(5) =2031a(6) =8465a(7) =32495a(8) =135441a(9) =519919a(10) =2167057a(11) =8318703a(12) =34672913a(13) =133099247a(14) =554766609a(15) =2129587951a(16) =8876265745a(17) =34073407215a(18) =142020251921a(19) =545174515439