Expansion of g.f. 1/((1-2*x)*(1-5*x)).

Terms

a(0) =1a(1) =7a(2) =39a(3) =203a(4) =1031a(5) =5187a(6) =25999a(7) =130123a(8) =650871a(9) =3254867a(10) =16275359a(11) =81378843a(12) =406898311a(13) =2034499747a(14) =10172515119a(15) =50862608363a(16) =254313107351