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A223001 Number of 2Xn 0..2 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
2, 7, 45, 272, 1814, 12742, 87682, 608358, 4249808, 29840968, 210352688, 1488131168, 10553965640, 75038380408, 534638034296, 3816328740984, 27285917390928, 195374729171232, 1400767518477984, 10054924676368736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A223000

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..160

EXAMPLE

Some solutions for n=3

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

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

CROSSREFS

Sequence in context: A108240 A064606 A331711 * A066612 A098637 A162045

Adjacent sequences:  A222998 A222999 A223000 * A223002 A223003 A223004

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 11 2013

STATUS

approved

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Last modified January 26 23:54 EST 2022. Contains 350601 sequences. (Running on oeis4.)