Number of nX3 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317891
Number of nX3 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =13a(4) =59a(5) =252a(6) =1074a(7) =4633a(8) =19933a(9) =85732a(10) =368847a(11) =1586817a(12) =6826551a(13) =29368380a(14) =126345008a(15) =543545426a(16) =2338372742a(17) =10059853024a(18) =43278232785a(19) =186186164251a(20) =800986675100
External references
- oeis: A317891