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A222831 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order 1
6, 613, 114782, 23567385, 5026137016, 1093286140097, 240791286159691, 53509887603503644, 11973329684485913722, 2693909098107381431482, 608845475416039463267176, 138122543896575176671661121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A222832

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A255886 A300389 A172899 * A206458 A265116 A132928

Adjacent sequences:  A222828 A222829 A222830 * A222832 A222833 A222834

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 06 2013

STATUS

approved

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Last modified August 12 09:31 EDT 2022. Contains 356069 sequences. (Running on oeis4.)