A268161 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0.

0, 6, 36, 906, 31818, 770406, 28194516, 857204082, 29334686760, 981701367120, 33610273278060, 1163386717573176, 40538287466544630, 1426710530475496692, 50491865673413814126, 1798794705043994212440, 64408154737694955274872

Offset: 1

Author

R. H. Hardin, Jan 27 2016

Keywords

• nonn

Comments

Row 4 of A268159.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..20

Crossrefs

Cf. A268159.