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A213694 Half the number of (n+1)X(n+1) symmetric 0..5 arrays with no 2X2 subblock summing to 10 0
99, 17499, 16537086, 83545858925, 2256314178023600, 325754552781442854792, 251417716503635583550380605 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A213697

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A274743 A244842 A190921 * A295434 A233227 A132607

Adjacent sequences:  A213691 A213692 A213693 * A213695 A213696 A213697

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 18 2012

STATUS

approved

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Last modified August 19 23:59 EDT 2022. Contains 356231 sequences. (Running on oeis4.)