A198525 Number of nX5 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.

52, 81844, 222590953, 634586561196, 1814002928583853, 5186266567454077293, 14827770532074166305565, 42393290191915767856385826, 121204405622972228787863169567, 346529082914494875185400399625818

Offset: 1

Author

R. H. Hardin Oct 26 2011

Keywords

• nonn

Comments

Column 5 of A198528

Examples

			Some solutions for n=4
..0..0..1..2..3....0..1..2..2..0....0..1..0..2..2....0..1..1..2..3
..1..1..0..1..4....1..1..0..3..1....1..1..0..3..0....1..1..0..1..2
..0..0..1..2..2....0..0..1..0..3....0..0..1..0..2....0..0..1..0..4
..0..0..1..0..3....0..0..1..2..1....0..0..1..3..1....0..0..1..3..3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..64