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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2014
STATUS
approved

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Last modified July 21 18:17 EDT 2024. Contains 374475 sequences. (Running on oeis4.)