A213960 Number of n X n 0..6 matrices with row and column i=1..n having sum <= i*6.

7, 980, 3323712, 256652587891, 447939229940051654, 17583943206407091985366455

Offset

1,1

Comments

Column 6 of A213962.

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
..0..2..3..0....1..2..0..0....2..3..0..0....1..1..3..0....5..0..0..1
..0..5..5..0....1..4..0..1....0..3..1..5....1..1..6..0....1..0..1..4
..5..0..3..6....1..5..3..3....0..3..4..4....4..4..1..0....0..1..3..4
..0..0..4..5....0..0..1..0....3..0..4..1....0..5..2..5....0..4..6..6

Crossrefs

Cf. A213962.

Sequence in context: A286913 A201070 A332197 * A173852 A062841 A349736

Adjacent sequences: A213957 A213958 A213959 * A213961 A213962 A213963

Keyword

nonn

Author

R. H. Hardin, Jun 28 2012

Status

approved