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A182293 Number of lower triangular n X n arrays of integers 0 upwards introduced in row major order, with each element unique in its row and column. 0
1, 2, 22, 2418, 4276864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=4:

..0........0........0........0........0........0........0........0

..1.2......1.2......1.0......1.2......1.2......1.2......1.2......1.0

..3.4.1....3.4.5....2.3.4....3.0.4....3.4.5....3.1.4....3.4.5....2.3.4

..5.3.4.2..5.1.4.3..5.2.0.1..4.5.3.6..5.6.4.2..2.5.3.4..6.5.7.0..5.6.3.2

CROSSREFS

Sequence in context: A113761 A319620 A054349 * A222000 A261400 A113930

Adjacent sequences:  A182290 A182291 A182292 * A182294 A182295 A182296

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Apr 24 2012

STATUS

approved

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Last modified April 17 11:26 EDT 2021. Contains 343064 sequences. (Running on oeis4.)