Expansion of Product_{k>=1} 1 / (1 - 6^(k-1)*x^k).

Terms

a(0) =1a(1) =1a(2) =7a(3) =43a(4) =295a(5) =1807a(6) =12391a(7) =75895a(8) =512647a(9) =3179815a(10) =21196807a(11) =131258311a(12) =875934727a(13) =5416216711a(14) =35763798535a(15) =223059458311