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A252393 Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum less than 4 1
21544, 437023, 9807871, 203636149, 4246242886, 89843675557, 1892602521123, 39809382457721, 838416758796711, 17657051023542125, 371771844206074736, 7828257407198464484, 164840943826619948011, 3471012673803505488234 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A252397

LINKS

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

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Sequence in context: A096554 A295994 A063388 * A211236 A221002 A190470

Adjacent sequences:  A252390 A252391 A252392 * A252394 A252395 A252396

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified September 24 09:10 EDT 2021. Contains 347630 sequences. (Running on oeis4.)