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A183701 Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock nonsingular. 0
192, 108624, 710460576, 53961750797424, 47524363124861668992, 485531851352905710505726272, 57535515249805594625825370853448832 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for 3 X 3
..1..0..1....1..1..3....3..1..2....1..1..3....1..2..0....2..2..2....1..0..1
..0..3..2....3..1..1....1..1..1....3..0..1....1..3..1....0..2..0....3..2..2
..1..2..1....0..3..0....3..2..1....0..3..1....2..1..0....2..1..2....3..1..3
CROSSREFS
Diagonal of A183710.
Sequence in context: A299993 A208444 A146554 * A208795 A203490 A008698
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved

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Last modified April 22 17:45 EDT 2024. Contains 371906 sequences. (Running on oeis4.)