Expansion of Product_{k>=1} (1 + x^k)^(binomial(2*k,k)/(k+1)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =20a(5) =67a(6) =222a(7) =758a(8) =2617a(9) =9189a(10) =32554a(11) =116494a(12) =420046a(13) =1525221a(14) =5571065a(15) =20457808a(16) =75476447a(17) =279636977a(18) =1039965746a(19) =3880891892a(20) =14527657602a(21) =54537434161a(22) =205270200229a(23) =774460385687