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A222721 Number of nX5 0..3 arrays with exactly floor(nX5/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order 0
20, 6524, 2807505, 1928517786, 662075303107, 474459483232672, 159780846921127290, 118321716926292008569 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A222722

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A123379 A175015 A135292 * A223051 A222744 A234459

Adjacent sequences:  A222718 A222719 A222720 * A222722 A222723 A222724

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 03 2013

STATUS

approved

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Last modified March 5 15:22 EST 2021. Contains 341825 sequences. (Running on oeis4.)