Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.

A260278

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.

Terms

    a(0) =46a(1) =85a(2) =230a(3) =525a(4) =1150a(5) =2726a(6) =6351a(7) =14393a(8) =33241a(9) =77098a(10) =177043a(11) =407486a(12) =941020a(13) =2167955a(14) =4992417a(15) =11510489a(16) =26530166a(17) =61125209a(18) =140873214a(19) =324678646a(20) =748199483a(21) =1724247325a(22) =3973747017a(23) =9157675382a(24) =21104202919a(25) =48636225966

External references