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A203102 Number of n X n binary arrays with every 1 immediately preceded by 0 0 to the left or above 0
1, 1, 23, 592, 27930, 4984843, 2482513429, 3024912314764, 10252037660298200, 96894129507021776898, 2459526431235740649572096, 169397666939694686725348936336, 31898632588336093438359543528177154 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A203108

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A043347 A015696 A106538 * A294995 A142750 A202667

Adjacent sequences:  A203099 A203100 A203101 * A203103 A203104 A203105

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 29 2011

STATUS

approved

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Last modified January 23 21:55 EST 2021. Contains 340386 sequences. (Running on oeis4.)