Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302625

Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =8a(1) =81a(2) =71a(3) =130a(4) =251a(5) =497a(6) =1051a(7) =2274a(8) =4999a(9) =10972a(10) =24236a(11) =53509a(12) =118285a(13) =261369a(14) =577860a(15) =1277311a(16) =2823836a(17) =6242370a(18) =13800217a(19) =30507579a(20) =67443317a(21) =149095642a(22) =329605433a(23) =728654642a(24) =1610832508a(25) =3561051759a(26) =7872390883a(27) =17403425209

External references