Expansion of Product_{m>0} (1+q^m)^(m(m+1)/2).

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =19a(5) =46a(6) =100a(7) =218a(8) =460a(9) =965a(10) =1975a(11) =3993a(12) =7975a(13) =15712a(14) =30650a(15) =59150a(16) =113093a(17) =214300a(18) =402812a(19) =751165a(20) =1390714a(21) =2557004a(22) =4670770a(23) =8479232a(24) =15302657a(25) =27462424a(26) =49021252a(27) =87057783a(28) =153850769a(29) =270614429