A268051 Number of n X n 0..2 arrays with new values introduced in each row and column in sequential order starting with zero.

1, 2, 18, 1082, 560778, 2666449962, 116124404018058, 45944873892068760842, 164311405786753523443114218, 5298327789094557001583255058644522, 1538780360110790603716817054271433490324298

Offset

1,2

Comments

Diagonal of A268056.

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

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..1..0..1....0..0..0..0....0..1..1..0....0..0..1..1....0..1..1..0
..0..0..1..0....0..1..1..0....0..1..1..0....0..0..1..1....0..1..2..0
..0..1..0..2....0..0..0..0....0..1..0..1....0..0..1..2....0..1..1..0

Crossrefs

Cf. A268056.

Sequence in context: A334553 A369677 A013040 * A268074 A202544 A203421

Adjacent sequences: A268048 A268049 A268050 * A268052 A268053 A268054

Keyword

nonn

Author

R. H. Hardin, Jan 25 2016

Status

approved