Expansion of Product_{k>=1} 1 / (1 - 2*x^k - 3*x^(2*k))^(1/2).

Terms

a(0) =1a(1) =1a(2) =4a(3) =9a(4) =27a(5) =67a(6) =193a(7) =515a(8) =1462a(9) =4070a(10) =11588a(11) =32898a(12) =94389a(13) =271017a(14) =782401a(15) =2263002a(16) =6565987a(17) =19086043a(18) =55597255a(19) =162207806a(20) =473992799a(21) =1386875848a(22) =4062919108a(23) =11915397853a(24) =34979609583a(25) =102781548770a(26) =302259362326a(27) =889566748760