Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

A260603

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

Terms

    a(0) =58a(1) =118a(2) =250a(3) =532a(4) =1136a(5) =2480a(6) =5418a(7) =11776a(8) =25694a(9) =56138a(10) =122376a(11) =266782a(12) =582226a(13) =1270070a(14) =2769414a(15) =6041044a(16) =13178442a(17) =28742456a(18) =62690698a(19) =136748242a(20) =298274638a(21) =650578696a(22) =1419055920a(23) =3095272272a(24) =6751343236a(25) =14725993444a(26) =32120472836

External references