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A213701 Half the number of 6X6 0..n symmetric arrays with no 2X2 subblock summing to 2n 1
5148, 168382284, 193946752094, 34389632236877, 2256314178023600, 72037480156866493, 1425762604012263360, 19265705246048238885, 196522537519121864954, 1582723194473524459497, 10592676749133340851406 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A213697

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..15

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A230575 A251244 A188338 * A224462 A251679 A151628

Adjacent sequences:  A213698 A213699 A213700 * A213702 A213703 A213704

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 18 2012

STATUS

approved

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Last modified May 16 14:39 EDT 2021. Contains 343949 sequences. (Running on oeis4.)