Number of nX4 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317819
Number of nX4 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =50a(2) =135a(3) =702a(4) =2726a(5) =11768a(6) =48526a(7) =203049a(8) =846901a(9) =3533862a(10) =14751288a(11) =61572336a(12) =256988741a(13) =1072703816a(14) =4477368403a(15) =18688452762a(16) =78005403965a(17) =325591740543
External references
- oeis: A317819