Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.

A259956

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.

Terms

    a(0) =67a(1) =146a(2) =439a(3) =1187a(4) =3227a(5) =8964a(6) =24719a(7) =67952a(8) =187266a(9) =516133a(10) =1421669a(11) =3916441a(12) =10790266a(13) =29726787a(14) =81895288a(15) =225619582a(16) =621575781a(17) =1712418521a(18) =4717655719a(19) =12996990098a(20) =35806276733a(21) =98645103102a(22) =271764008258a(23) =748700872883

External references