Number of isonemal fabrics of period exactly n.

Terms

a(0) =1a(1) =1a(2) =4a(3) =4a(4) =9a(5) =8a(6) =55a(7) =21a(8) =104a(9) =62a(10) =429a(11) =196a(12) =800a(13) =698a(14) =4674a(15) =2070a(16) =7721a(17) =7154