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A211886 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, and containing the value n(n+1)/2-3 0
0, 2, 19, 236, 1726, 8471, 31732 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A211888

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

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

..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2

..3.4.5....3.4.5....3.4.5....3.4.5....3.4.2....3.4.5....3.4.2....2.0.3

..6.7.3.1..2.6.7.0..6.7.2.1..6.1.3.7..5.6.4.7..6.7.1.0..5.6.7.0..4.5.6.7

CROSSREFS

Sequence in context: A232525 A024227 A106945 * A125632 A124125 A234505

Adjacent sequences:  A211883 A211884 A211885 * A211887 A211888 A211889

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 24 2012

STATUS

approved

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Last modified October 22 01:46 EDT 2020. Contains 337948 sequences. (Running on oeis4.)