Difference between 2^(2n-1) and the nearest square.

Terms

a(0) =1a(1) =-1a(2) =-4a(3) =7a(4) =-17a(5) =23a(6) =-89a(7) =7a(8) =28a(9) =112a(10) =448a(11) =1792a(12) =-4417a(13) =5503a(14) =22012a(15) =-4633a(16) =-18532a(17) =-74128a(18) =-296512a(19) =296863a(20) =1187452a(21) =-1181833a(22) =-4727332a(23) =4817239a(24) =19268956a(25) =-17830441a(26) =-71321764a(27) =94338007a(28) =377352028a(29) =-9092137