Expansion of (Product_{j>=1} (1-(-x)^j) - 1)^21 in powers of x.

Terms

a(0) =1a(1) =-21a(2) =210a(3) =-1330a(4) =5964a(5) =-19929a(6) =50253a(7) =-91920a(8) =97965a(9) =51604a(10) =-526659a(11) =1389297a(12) =-2280320a(13) =2118690a(14) =769065a(15) =-7613319a(16) =17220042a(17) =-23999430a(18) =18024405a(19) =10748850a(20) =-63778953a(21) =124134772a(22) =-152793270a(23) =99072120a(24) =71722224a(25) =-341062407a(26) =610085721