Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300493
Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =18a(2) =52a(3) =143a(4) =412a(5) =1225a(6) =3699a(7) =11243a(8) =34012a(9) =102446a(10) =307967a(11) =926094a(12) =2787783a(13) =8398551a(14) =25307489a(15) =76250370a(16) =229695945a(17) =691863018a(18) =2083934202a(19) =6277172983a(20) =18908580942a(21) =56958622146a(22) =171576895601a(23) =516838549210
External references
- oeis: A300493