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A252442 Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum less than 3 1
1677, 13777, 131202, 1149386, 10157387, 91120655, 812431496, 7240016321, 64612694441, 576415113903, 5141552056964, 45867546386571, 409176329077618, 3650126535107922, 32561858854371260, 290476235647305936 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A252447

LINKS

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

R. H. Hardin, Empirical recurrence of order 65

FORMULA

Empirical recurrence of order 65 (see link above)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A145755 A252300 A339960 * A159625 A156425 A247853

Adjacent sequences:  A252439 A252440 A252441 * A252443 A252444 A252445

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified August 17 07:10 EDT 2022. Contains 356184 sequences. (Running on oeis4.)