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 A251129 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements 0
 40, 416, 1997, 8008, 25597, 79226, 223663, 620524, 1653313, 4340190, 11150995, 28282512, 70727013, 174943234, 428129015, 1038115892 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A251137 LINKS Table of n, a(n) for n=1..16. EXAMPLE Some solutions for n=4 ..0..0..0..0..2....0..0..0..1..2....0..0..2..2..2....0..1..0..2..2 ..1..1..1..1..2....0..0..0..0..1....2..0..1..0..0....0..1..0..2..0 ..0..0..0..0..1....2..0..0..0..1....2..0..1..0..0....0..1..0..2..0 ..0..0..0..0..0....2..0..0..0..1....2..0..1..0..0....0..1..0..2..0 ..1..1..1..1..0....2..0..0..0..1....2..0..1..0..0....2..1..0..2..0 CROSSREFS Sequence in context: A253132 A293969 A168192 * A007772 A228122 A247408 Adjacent sequences: A251126 A251127 A251128 * A251130 A251131 A251132 KEYWORD nonn AUTHOR R. H. Hardin, Nov 30 2014 STATUS approved

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Last modified November 30 05:42 EST 2023. Contains 367454 sequences. (Running on oeis4.)