Expansion of 1/(sqrt(1-3*x)*sqrt(1-7*x)).

Terms

a(0) =1a(1) =5a(2) =27a(3) =155a(4) =931a(5) =5775a(6) =36645a(7) =236325a(8) =1542195a(9) =10153775a(10) =67313377a(11) =448691985a(12) =3004182349a(13) =20188647185a(14) =136094684907a(15) =919884469275