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

A302362

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

Terms

    a(0) =1a(1) =12a(2) =31a(3) =109a(4) =397a(5) =1430a(6) =5110a(7) =18395a(8) =66203a(9) =238103a(10) =856413a(11) =3081033a(12) =11083994a(13) =39873749a(14) =143444250a(15) =516038048a(16) =1856433397a(17) =6678469130a(18) =24025629692a(19) =86431623758a(20) =310935653685

External references