Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301966

Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =8a(1) =34a(2) =40a(3) =64a(4) =111a(5) =219a(6) =443a(7) =904a(8) =1860a(9) =3856a(10) =8015a(11) =16659a(12) =34647a(13) =72088a(14) =150004a(15) =312144a(16) =649555a(17) =1351723a(18) =2812951a(19) =5853784a(20) =12181816a(21) =25350576a(22) =52755019a(23) =109784179a(24) =228462939a(25) =475435704a(26) =989390720a(27) =2058940864a(28) =4284695031

External references