The q-series expansion of an expression related to fermionic systems.

Terms

a(0) =0a(1) =0a(2) =0a(3) =12a(4) =0a(5) =60a(6) =36a(7) =168a(8) =384a(9) =396a(10) =1620a(11) =1452a(12) =5388a(13) =6396a(14) =14616a(15) =25860a(16) =40128a(17) =87108a(18) =115992a(19) =259236a(20) =358860a(21) =710220a(22) =1096392a(23) =1885080a(24) =3216768a(25) =4991700a(26) =8916024a(27) =13349448a(28) =23633064a(29) =35731944