Sum of the squares modulo 2^n of the odd numbers less than 2^n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =40a(4) =208a(5) =928a(6) =3904a(7) =16000a(8) =64768a(9) =260608a(10) =1045504a(11) =4188160a(12) =16764928a(13) =67084288a(14) =268386304a(15) =1073643520a(16) =4294770688a(17) =17179475968a(18) =68718690304a(19) =274876334080