Constant term in (1+x)^n mod (1+x^4).

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =-4a(5) =-14a(6) =-34a(7) =-68a(8) =-116a(9) =-164a(10) =-164a(11) =0a(12) =560a(13) =1912a(14) =4616a(15) =9232a(16) =15760a(17) =22288a(18) =22288a(19) =0a(20) =-76096a(21) =-259808a(22) =-627232a(23) =-1254464a(24) =-2141504a(25) =-3028544a(26) =-3028544a(27) =0a(28) =10340096a(29) =35303296