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A203968 Number of n X n 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by 0 1 to the left or above 0
1, 7, 258, 34799, 22100882, 64449537503, 847220834970347, 50681890300309193984, 13775254400039658772386790, 17006093281906665293267116254138 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203975

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

..0..0..0..0....0..0..1..0....0..0..0..0....0..0..1..0....0..0..1..2

..1..1..0..1....1..1..0..0....0..1..1..1....1..1..0..0....0..0..0..0

..0..0..0..1....0..0..1..2....1..2..0..0....0..1..0..0....0..1..0..1

..1..0..1..0....0..0..0..0....2..0..1..2....0..1..2..1....0..0..0..1

CROSSREFS

Sequence in context: A165437 A232304 A254127 * A174251 A269576 A130741

Adjacent sequences: A203965 A203966 A203967 * A203969 A203970 A203971

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2012

STATUS

approved

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Last modified January 27 12:00 EST 2023. Contains 359839 sequences. (Running on oeis4.)