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

A300534

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

Terms

    a(0) =1a(1) =5a(2) =12a(3) =36a(4) =122a(5) =429a(6) =1585a(7) =5755a(8) =21084a(9) =77823a(10) =286982a(11) =1060139a(12) =3917406a(13) =14477542a(14) =53517820a(15) =197837108a(16) =731366681a(17) =2703796615a(18) =9995728589a(19) =36953720967a(20) =136616452365a(21) =505066168745

External references