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A278728 Number of nX2 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. 1
6, 152, 1947, 17352, 121520, 712406, 3633649, 16547278, 68531079, 261693631, 931194981, 3113638802, 9849622993, 29642927267, 85271613063, 235393492799, 625708778733, 1606286648601, 3992748071821, 9631887926896, 22595573914587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A278734.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 28

FORMULA

Empirical polynomial of degree 28 (see link above)

EXAMPLE

Some solutions for n=4

..2..2. .1..1. .2..1. .1..1. .2..0. .1..0. .3..0. .0..0. .1..1. .2..2

..3..0. .1..1. .2..2. .3..2. .3..2. .3..2. .3..0. .3..1. .2..1. .3..0

..0..2. .0..0. .1..0. .2..2. .0..0. .0..0. .3..0. .1..0. .2..2. .2..3

..0..2. .1..1. .1..0. .2..3. .2..0. .0..1. .2..1. .1..0. .1..0. .3..2

CROSSREFS

Cf. A278734.

Sequence in context: A168654 A147796 A003766 * A221689 A319036 A185211

Adjacent sequences:  A278725 A278726 A278727 * A278729 A278730 A278731

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 27 2016

STATUS

approved

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Last modified August 8 09:16 EDT 2020. Contains 336293 sequences. (Running on oeis4.)