Expansion of Product_{k>=0} 1 / (1 - 3*x^(3^k)).

Terms

a(0) =1a(1) =3a(2) =9a(3) =30a(4) =90a(5) =270a(6) =819a(7) =2457a(8) =7371a(9) =22143a(10) =66429a(11) =199287a(12) =597951a(13) =1793853a(14) =5381559a(15) =16144947a(16) =48434841a(17) =145304523a(18) =435914388a(19) =1307743164a(20) =3923229492a(21) =11769690933a(22) =35309072799a(23) =105927218397a(24) =317781662562a(25) =953344987686