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A203356 Number of n X n binary arrays with every 1 immediately preceded by 0 to the left or above 1
1, 7, 102, 5677, 984703, 572818585, 1089970014327, 6842701992875869, 141313097261182627960, 9609805102278645983838526, 2151172274505675499995093835341, 1585313606427874519807992162372572320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203362

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..22

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A329239 A020477 A348887 * A346719 A223239 A140633

Adjacent sequences:  A203353 A203354 A203355 * A203357 A203358 A203359

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified January 26 23:09 EST 2022. Contains 350601 sequences. (Running on oeis4.)