Number of n X n circulant singular matrices over GF(2).

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =17a(5) =40a(6) =79a(7) =128a(8) =323a(9) =544a(10) =1025a(11) =2560a(12) =4097a(13) =10112a(14) =22643a(15) =32768a(16) =66047a(17) =165376a(18) =262145a(19) =557056a(20) =1513709a(21) =2099200a(22) =4198399a(23) =10485760a(24) =17825807a(25) =33562624a(26) =84672701a(27) =165675008a(28) =268435457a(29) =741965824