Expansion of Sum_{n>=0} 5^n * (2*4^n + 1)/3 * x^(n*(n+1)/2).

Terms

a(0) =1a(1) =15a(2) =0a(3) =275a(4) =0a(5) =0a(6) =5375a(7) =0a(8) =0a(9) =0a(10) =106875a(11) =0a(12) =0a(13) =0a(14) =0a(15) =2134375a(16) =0a(17) =0a(18) =0a(19) =0a(20) =0a(21) =42671875a(22) =0a(23) =0a(24) =0a(25) =0a(26) =0a(27) =0a(28) =853359375a(29) =0