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A223042 Number of 2Xn 0..3 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..3 order 1
2, 8, 98, 1265, 17356, 241583, 3395532, 48048796, 683306658, 9759462283, 139866408792, 2010279482902, 28963821801648, 418182844095108, 6048773850787538, 87632133398349504, 1271377018275506438 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A223041

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..61

EXAMPLE

Some solutions for n=3

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

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

CROSSREFS

Sequence in context: A001697 A006069 A270485 * A052457 A119654 A333439

Adjacent sequences:  A223039 A223040 A223041 * A223043 A223044 A223045

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2013

STATUS

approved

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Last modified June 4 06:41 EDT 2020. Contains 334822 sequences. (Running on oeis4.)