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A221826 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns 1
0, 73, 2879, 115417, 4755445, 194407111, 7954432829, 325446165881, 13315083231576, 544765825231628, 22288229643043523, 911887582567144091, 37308434607556030347, 1526415443763878545790, 62450867501566841285468 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221828

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..46

EXAMPLE

Some solutions for n=3

..0..2..2..1....1..1..1..1....0..2..2..2....0..2..0..2....0..1..0..1

..1..0..1..0....2..1..1..0....0..1..1..1....2..1..0..1....0..3..1..2

..2..1..1..1....0..2..2..0....1..0..1..1....1..1..2..0....1..1..2..0

CROSSREFS

Sequence in context: A332912 A017789 A017736 * A093273 A183540 A022242

Adjacent sequences:  A221823 A221824 A221825 * A221827 A221828 A221829

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 26 2013

STATUS

approved

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Last modified September 25 10:05 EDT 2020. Contains 337337 sequences. (Running on oeis4.)