Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A301325

Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =18a(4) =25a(5) =89a(6) =233a(7) =552a(8) =1559a(9) =4206a(10) =11455a(11) =31045a(12) =85231a(13) =232290a(14) =634523a(15) =1734730a(16) =4739443a(17) =12951941a(18) =35393517a(19) =96729068a(20) =264330489a(21) =722375126a(22) =1974122009a(23) =5394894605a(24) =14743271905a(25) =40290668634a(26) =110107068099a(27) =300902363502

External references