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A280311 Number of nX4 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 1
1, 222, 20274, 1047790, 43973846, 1638451216, 56602534187, 1855013487412, 58477471703834, 1789245480207404, 53466135036128845, 1567267054619722560, 45216089994262687510, 1287122022861142748302, 36222158292582837870301 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 4 of A280313.
LINKS
EXAMPLE
Some solutions for n=3
..0..1..2..0. .0..1..1..2. .0..1..0..2. .0..0..0..0. .0..0..1..1
..2..1..2..1. .2..0..2..2. .2..1..1..2. .1..1..0..1. .1..0..2..0
..1..1..0..0. .1..0..0..1. .1..1..2..0. .0..2..2..0. .0..2..2..0
CROSSREFS
Cf. A280313.
Sequence in context: A251059 A220230 A281696 * A268024 A267931 A268017
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2016
STATUS
approved

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)