A235815 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing rowwise and columnwise

256, 2648, 2648, 26852, 84300, 26852, 231182, 2904651, 2904651, 231182, 1922672, 78133908, 401195649, 78133908, 1922672, 14817810, 2024258650, 40931219364, 40931219364, 2024258650, 14817810, 110573053, 45232185179, 4011288173007

Offset

1,1

Comments

Table starts

.......256.........2648...........26852...........231182..........1922672

......2648........84300.........2904651.........78133908.......2024258650

.....26852......2904651.......401195649......40931219364....4011288173007

....231182.....78133908.....40931219364...16476607620547.6446221312475127

...1922672...2024258650...4011288173007.6446221312475127

..14817810..45232185179.319846755566490

.110573053.960244682353

.791130664

Links

R. H. Hardin, Table of n, a(n) for n = 1..40

Example

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

Crossrefs

Column 1 is A235749

Sequence in context: A236505 A236501 A235752 * A235749 A236596 A236593

Adjacent sequences: A235812 A235813 A235814 * A235816 A235817 A235818

Keyword

nonn,tabl

Author

R. H. Hardin, Jan 16 2014

Status

approved