A213957 Number of n X n 0..3 matrices with row and column i=1..n having sum <= i*3.

4, 120, 32060, 74323976, 1494988224948, 261421322089741976, 398278555474658144086480, 5298226825488439815883527067288

Offset: 1

Author

R. H. Hardin Jun 28 2012

Keywords

• nonn

Comments

Column 3 of A213962

Examples

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