Expansion of Product_{m>=1} (1+q^m)^(-13).

Terms

a(0) =1a(1) =-13a(2) =78a(3) =-299a(4) =884a(5) =-2314a(6) =5681a(7) =-13052a(8) =28158a(9) =-58136a(10) =116129a(11) =-224692a(12) =422214a(13) =-774372a(14) =1390948a(15) =-2450565a(16) =4240561a(17) =-7221383a(18) =12121980a(19) =-20076953a(20) =32836752a(21) =-53089309a(22) =84922877a(23) =-134488770a(24) =210979548