1/8 the number of nX3 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185900
1/8 the number of nX3 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =196a(2) =7854a(3) =546280a(4) =28967421a(5) =1748982326a(6) =98953708266
External references
- oeis: A185900