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

1,2

Comments

Row 4 of A268159.

Links

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

Example

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

Crossrefs

Cf. A268159.

Sequence in context: A222780 A206636 A244841 * A082027 A203106 A351796

Adjacent sequences: A268158 A268159 A268160 * A268162 A268163 A268164

Keyword

nonn

Author

R. H. Hardin, Jan 27 2016

Status

approved