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A251907 Number of (n+2)X(2+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 4 or 5 1
87472, 1524496, 31829596, 634891856, 13021221976, 273455709590, 5736244294410, 120526186216112, 2541263626822798, 53645899122636266, 1133356776834050890, 23966135822457282108, 507119909614017945682, 10735550087632824612072 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A251909

LINKS

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

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Sequence in context: A098186 A069313 A022207 * A238052 A118899 A253340

Adjacent sequences:  A251904 A251905 A251906 * A251908 A251909 A251910

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 10 2014

STATUS

approved

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Last modified December 1 04:02 EST 2021. Contains 349426 sequences. (Running on oeis4.)