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A222825 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
1, 8, 80, 1154, 14388, 200082, 2652496, 36622104, 498427856, 6893943128, 95040804864, 1319624517920, 18325966197056, 255430185200544, 3564132957005568, 49841772120587648, 697848234833263872 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222828

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..209

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A060375 A097815 A002718 * A057707 A222671 A271443

Adjacent sequences:  A222822 A222823 A222824 * A222826 A222827 A222828

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 06 2013

STATUS

approved

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Last modified October 1 13:04 EDT 2020. Contains 337443 sequences. (Running on oeis4.)