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A220028 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 n X n array 0
2, 4, 10, 34, 111, 358, 1165, 3789, 12375, 40583, 133632, 441773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A220032

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A089476 A323207 A327424 * A006397 A297197 A297201

Adjacent sequences:  A220025 A220026 A220027 * A220029 A220030 A220031

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 03 2012

STATUS

approved

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Last modified August 4 13:38 EDT 2020. Contains 336201 sequences. (Running on oeis4.)