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A278430
Number of nX2 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.
1
6, 100, 1609, 19624, 178352, 1287838, 7795151, 41058743, 193149285, 826734193, 3264405727, 12016477160, 41579224479, 136142690453, 424140541353, 1263030700894, 3609095743983, 9929303441355, 26377932553959, 67838309686132
OFFSET
1,1
COMMENTS
Column 2 of A278435.
FORMULA
Empirical polynomial of degree 31 (see link above)
EXAMPLE
Some solutions for n=4
..0..0. .0..2. .0..3. .2..3. .0..1. .0..3. .0..1. .0..0. .1..2. .0..3
..0..1. .2..1. .1..0. .1..2. .3..2. .3..1. .0..0. .1..3. .0..0. .3..0
..3..3. .1..3. .3..3. .3..0. .1..2. .0..1. .0..1. .0..3. .2..2. .0..0
..1..3. .3..1. .1..3. .3..2. .3..0. .3..2. .2..1. .3..1. .2..2. .0..3
CROSSREFS
Cf. A278435.
Sequence in context: A281502 A226413 A226344 * A374889 A131311 A098721
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 22 2016
STATUS
approved