Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.

A261108

Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.

Terms

    a(0) =63a(1) =106a(2) =278a(3) =566a(4) =1408a(5) =2902a(6) =7284a(7) =14942a(8) =37432a(9) =76838a(10) =192624a(11) =395390a(12) =990928a(13) =2034038a(14) =5098214a(15) =10464850a(16) =26228746a(17) =53838574a(18) =134940686a(19) =276986458a(20) =694234628a(21) =1425023498a(22) =3571661670a(23) =7331384958a(24) =18375286712a(25) =37718103630

External references