Expansion of (1-x-sqrt(1-6*x-7*x^2))/(2*(1+2*x)).

Terms

a(0) =1a(1) =2a(2) =8a(3) =36a(4) =180a(5) =956a(6) =5300a(7) =30316a(8) =177604a(9) =1060284a(10) =6427092a(11) =39452364a(12) =244748196a(13) =1532044572a(14) =9664688436a(15) =61380865452a(16) =392148430212