Number of binary strings of length n that are "weak abelian squares".

Terms

a(0) =0a(1) =2a(2) =2a(3) =6a(4) =2a(5) =36a(6) =2a(7) =94a(8) =128a(9) =476a(10) =2a(11) =2044a(12) =2a(13) =6600a(14) =12200a(15) =21326a(16) =2a(17) =114180a(18) =2a(19) =420196a(20) =611400a(21) =1377272a(22) =2a(23) =6880524a(24) =5162552a(25) =20385176a(26) =27057260a(27) =93466916a(28) =2a(29) =449091204