A268074 Number of n X n nonnegative integer arrays with new values introduced in each row and column in sequential order starting with zero.

1, 2, 18, 1094, 637358, 4617638834, 517992936833258, 1088597786720842334698, 50735031335891092927048172910, 60946941227979732761779089927221771422

Offset

1,2

Comments

Diagonal of A268079.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A268079.

Sequence in context: A369677 A013040 A268051 * A202544 A203421 A139111

Adjacent sequences: A268071 A268072 A268073 * A268075 A268076 A268077

Keyword

nonn

Author

R. H. Hardin, Jan 25 2016

Status

approved