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

A302729

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

Terms

    a(0) =0a(1) =23a(2) =83a(3) =89a(4) =287a(5) =689a(6) =1723a(7) =4491a(8) =10433a(9) =28009a(10) =73289a(11) =182043a(12) =464679a(13) =1196593a(14) =3100505a(15) =7907085a(16) =20156111a(17) =51965647a(18) =133805425a(19) =342839837a(20) =878417801a(21) =2258261501a(22) =5808644113a(23) =14907781647a(24) =38258830449a(25) =98318643559a(26) =252713316537

External references