A224018 Number of n X n 0..3 arrays with rows nondecreasing and antidiagonals unimodal.
4, 100, 6796, 772683, 120352359, 23151623729, 5173325036371, 1291969529189675, 351545826740833046, 102423287609988684833, 31560026488902316691503, 10191808855482615567911934, 3425597818181959478072701084
Offset: 1
Keywords
Examples
Some solutions for n=3 ..0..0..1....0..1..1....2..3..3....1..1..1....0..3..3....2..2..3....2..3..3 ..1..2..3....1..2..3....3..3..3....0..0..2....1..3..3....1..2..3....1..1..3 ..0..2..3....0..0..2....1..1..3....0..2..2....0..1..1....0..2..2....0..1..3
Comments