Number of (n+1) X 2 0..1 matrices with each 2 X 2 permanent equal.

Terms

a(0) =16a(1) =38a(2) =89a(3) =218a(4) =538a(5) =1349a(6) =3410a(7) =8690a(8) =22273a(9) =57362a(10) =148274a(11) =384389a(12) =998746a(13) =2599562a(14) =6775361a(15) =17677370a(16) =46158442a(17) =120601349a(18) =315252386a(19) =824369378a(20) =2156282881a(21) =5641333538a(22) =14761426274a(23) =38630362373a(24) =101104495018a(25) =264632791034