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A192842 Number of n X n symmetric 0..3 arrays with each element equal to at least two horizontal or vertical neighbors, containing at least one 3 and with new values 0..3 introduced in lower triangular row major order 0
0, 0, 0, 0, 0, 145, 6944, 635377, 69009813, 12541320254, 3495358855982, 1626847265319815, 1240274531663638765 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Some solutions for 6X6
..0..0..0..0..0..0....0..0..1..1..3..3....0..0..1..1..2..2....0..0..0..0..2..2
..0..0..1..1..0..0....0..0..1..1..3..3....0..0..1..1..2..2....0..0..0..0..2..2
..0..1..1..1..2..2....1..1..2..2..3..3....1..1..1..1..1..1....0..0..0..1..1..1
..0..1..1..2..2..2....1..1..2..2..3..3....1..1..1..1..1..1....0..0..1..1..1..1
..0..0..2..2..3..3....3..3..3..3..3..3....2..2..1..1..3..3....2..2..1..1..3..3
..0..0..2..2..3..3....3..3..3..3..3..3....2..2..1..1..3..3....2..2..1..1..3..3
CROSSREFS
Sequence in context: A008377 A076464 A018232 * A012813 A031612 A226849
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 11 2011
STATUS
approved

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Last modified April 14 00:20 EDT 2024. Contains 371652 sequences. (Running on oeis4.)