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A222839 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order 2
1, 8, 105, 1585, 23107, 353631, 5338646, 81874696, 1252153841, 19270376854, 296641979113, 4580055753005, 70780702170260, 1095722113681548, 16978656325074532, 263390892198118920, 4089414898741050209 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222842

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..0

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

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

CROSSREFS

Sequence in context: A239400 A001922 A264014 * A113551 A082735 A024358

Adjacent sequences:  A222836 A222837 A222838 * A222840 A222841 A222842

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 06 2013

STATUS

approved

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Last modified October 31 00:25 EDT 2020. Contains 338095 sequences. (Running on oeis4.)