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A213703 Half the number of 8X8 0..n symmetric arrays with no 2X2 subblock summing to 2n 0
1220409, 109492322533385, 22678299640600736258, 181744271406372884215557, 251417716503635583550380605, 100056407652480771734417515110 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A213697

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

..1..3..0..2..3..4..4..3....3..0..4..4..0..2..3..0....3..4..3..0..0..1..2..3

..3..2..1..3..3..4..3..4....0..4..1..1..2..1..0..0....4..3..4..2..3..0..1..4

..0..1..0..0..3..0..0..0....4..1..1..4..2..4..4..3....3..4..3..3..1..3..0..2

..2..3..0..3..1..0..2..2....4..1..4..3..2..3..0..4....0..2..3..2..1..4..2..3

..3..3..3..1..4..4..3..4....0..2..2..2..2..0..2..1....0..3..1..1..3..1..0..1

..4..4..0..0..4..2..4..1....2..1..4..3..0..4..0..1....1..0..3..4..1..4..2..3

..4..3..0..2..3..4..1..1....3..0..4..0..2..0..2..4....2..1..0..2..0..2..2..3

..3..4..0..2..4..1..1..0....0..0..3..4..1..1..4..0....3..4..2..3..1..3..3..4

CROSSREFS

Sequence in context: A203627 A235910 A234997 * A270268 A257152 A257159

Adjacent sequences:  A213700 A213701 A213702 * A213704 A213705 A213706

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 18 2012

STATUS

approved

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Last modified January 19 02:30 EST 2022. Contains 350464 sequences. (Running on oeis4.)