Number of n X 4 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 1 1 and 1 1 0 vertically.

A208003

Number of n X 4 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 1 1 and 1 1 0 vertically.

Terms

    a(0) =9a(1) =81a(2) =221a(3) =536a(4) =1711a(5) =4993a(6) =16742a(7) =53411a(8) =182247a(9) =608142a(10) =2095301a(11) =7157363a(12) =24822376a(13) =85845073a(14) =299033933a(15) =1040987192a(16) =3636447903a(17) =12703622001a(18) =44454269798a(19) =155590727603a(20) =545028524023

External references