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A268074 Number of n X n nonnegative integer arrays with new values introduced in each row and column in sequential order starting with zero. 0
1, 2, 18, 1094, 637358, 4617638834, 517992936833258, 1088597786720842334698, 50735031335891092927048172910, 60946941227979732761779089927221771422 (list; graph; refs; listen; history; text; internal format)
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: A334553 A013040 A268051 * A202544 A203421 A139111

Adjacent sequences:  A268071 A268072 A268073 * A268075 A268076 A268077

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 25 2016

STATUS

approved

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Last modified May 6 09:45 EDT 2021. Contains 343580 sequences. (Running on oeis4.)