Number of reducible Boolean polynomials of degree n with constant term 1.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =3a(5) =7a(6) =13a(7) =25a(8) =51a(9) =88a(10) =189a(11) =342a(12) =624a(13) =1194a(14) =2236a(15) =4016a(16) =7439a(17) =13670a(18) =24645a(19) =44928a(20) =81975a(21) =145655a(22) =264123a(23) =474559a(24) =840087a(25) =1512866a(26) =2694988a(27) =4753010a(28) =8444560a(29) =14974404