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A252314 Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7 1
1557, 2498, 4197, 7815, 15269, 28883, 56052, 111752, 222145, 444181, 897077, 1806148, 3657416, 7450174, 15181961, 31018187, 63563988, 130459945, 268427476, 553464891, 1142966125, 2364860929, 4901856593, 10176932382, 21164686115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A252321

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A166606 A252313 A252321 * A186393 A025026 A343867

Adjacent sequences:  A252311 A252312 A252313 * A252315 A252316 A252317

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 16 2014

STATUS

approved

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Last modified August 13 22:39 EDT 2022. Contains 356109 sequences. (Running on oeis4.)