Number of nX3 0..1 arrays with every element unequal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A320359

Number of nX3 0..1 arrays with every element unequal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =1a(2) =4a(3) =13a(4) =60a(5) =258a(6) =1111a(7) =4836a(8) =21007a(9) =91214a(10) =396170a(11) =1720608a(12) =7472694a(13) =32454615a(14) =140953263a(15) =612172021a(16) =2658715999a(17) =11547033504a(18) =50149763813a(19) =217804756979a(20) =945944877379

External references