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A278366
Number of nX2 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes.
1
0, 0, 59, 1465, 19047, 194726, 1734714, 13506810, 91496261, 543067118, 2862579656, 13596395709, 58966870090, 236182156566, 882025314222, 3095734502639, 10279759883927, 32476397677376, 98079088190039, 284292946153409
OFFSET
1,3
COMMENTS
Column 2 of A278372.
FORMULA
Empirical polynomial of degree 35 (see link above)
EXAMPLE
Some solutions for n=4
..2..1. .1..0. .2..1. .2..2. .2..1. .2..0. .2..2. .2..1. .2..2. .1..0
..1..0. .1..2. .2..2. .1..0. .1..1. .1..0. .2..0. .2..2. .2..1. .0..2
..0..2. .1..0. .1..1. .0..1. .0..0. .0..0. .0..0. .0..2. .0..0. .2..1
..1..2. .0..2. .1..0. .1..0. .2..2. .1..1. .2..1. .0..1. .2..1. .0..2
CROSSREFS
Cf. A278372.
Sequence in context: A248620 A374450 A210398 * A134652 A017775 A017722
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 19 2016
STATUS
approved