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A213695 Half the number of (n+1)X(n+1) symmetric 0..6 arrays with no 2X2 subblock summing to 12 0
159, 45892, 84059234, 976919547736, 72037480156866493, 33704464361612549676417, 100056407652480771734417515110 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A213697

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

..2..3..5..0..0....4..2..3..3..5....0..5..2..5..0....2..4..1..0..0

..3..2..1..1..2....2..0..3..1..5....5..1..2..2..6....4..1..0..3..6

..5..1..0..2..3....3..3..5..4..4....2..2..3..1..4....1..0..0..0..4

..0..1..2..0..0....3..1..4..4..3....5..2..1..3..1....0..3..0..4..5

..0..2..3..0..5....5..5..4..3..6....0..6..4..1..0....0..6..4..5..1

CROSSREFS

Sequence in context: A267964 A268029 A263518 * A224430 A013454 A013455

Adjacent sequences:  A213692 A213693 A213694 * A213696 A213697 A213698

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 18 2012

STATUS

approved

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Last modified June 27 13:59 EDT 2022. Contains 354896 sequences. (Running on oeis4.)