Coefficient of x^n in Product_{k>=1} 1/(1+x^k)^n.

Terms

a(0) =-1a(1) =1a(2) =-4a(3) =17a(4) =-56a(5) =172a(6) =-547a(7) =1809a(8) =-6061a(9) =20316a(10) =-68135a(11) =229244a(12) =-774372a(13) =2624119a(14) =-8912759a(15) =30328593a(16) =-103382254a(17) =352975681a(18) =-1206921212a(19) =4132159452a(20) =-14163858895a(21) =48601267199a(22) =-166930975524a(23) =573872089212