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A251121 Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements 0
10, 40, 108, 266, 580, 1214, 2420, 4702, 8926, 16680, 30766, 56180, 101734, 182956, 327080, 581742, 1030000, 1816290, 3191136, 5588050, 9755530, 16983260, 29489098 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A251128

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A131037 A071233 A063490 * A002419 A199826 A227056

Adjacent sequences:  A251118 A251119 A251120 * A251122 A251123 A251124

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 30 2014

STATUS

approved

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Last modified October 15 16:01 EDT 2018. Contains 316236 sequences. (Running on oeis4.)