A221479 Number of nX4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction

1, 73, 1407, 34751, 865318, 21576814, 538159483, 13422938865, 334800425933, 8350733876991, 208287552769998, 5195196692208296, 129580804689787280, 3232059523406689453, 80615402781266738787, 2010743650758352091582

Offset

1,2

Comments

Column 4 of A221483

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

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

Crossrefs

Sequence in context: A090685 A232297 A008392 * A253263 A098676 A056214

Adjacent sequences: A221476 A221477 A221478 * A221480 A221481 A221482

Keyword

nonn

Author

R. H. Hardin Jan 17 2013

Status

approved