Number of nX3 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
A198523
Number of nX3 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
Terms
- a(0) =5a(1) =193a(2) =16714a(3) =1877316a(4) =222590953a(5) =26670041125
External references
- oeis: A198523