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A206930 Number of n X n 0..1 arrays avoiding 0 0 0 horizontally and 0 1 1 vertically 0
2, 16, 211, 6837, 418876, 40316253, 8138711727, 2968348851593, 1635655868695143, 1996781212118762256, 4440970754945359464401, 13563038968625915203795793 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206936

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A222523 A004121 A188600 * A206865 A114531 A012056

Adjacent sequences:  A206927 A206928 A206929 * A206931 A206932 A206933

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 13 2012

STATUS

approved

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Last modified April 24 00:02 EDT 2019. Contains 322404 sequences. (Running on oeis4.)