A251020 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements

110, 2546, 20608, 119632, 516684, 2160510, 7948184, 29146692, 100696896, 345190686, 1144782282, 3748752570, 12009496342, 37949629638

Offset

1,1

Comments

Diagonal of A251028

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=4
..0..1..1..1..2....0..1..1..1..3....0..0..0..0..3....0..0..1..1..3
..0..0..0..0..1....0..0..0..0..2....0..0..0..0..3....3..0..1..0..2
..2..2..2..2..2....0..0..0..0..1....1..1..1..1..2....3..0..1..0..2
..1..0..0..0..0....0..0..0..0..0....2..0..0..0..1....3..0..1..0..1
..2..0..0..0..0....3..3..2..2..1....3..1..1..0..0....3..0..1..0..0

Crossrefs

Sequence in context: A205348 A008450 A163729 * A245876 A185536 A201833

Adjacent sequences: A251017 A251018 A251019 * A251021 A251022 A251023

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved