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A278381
Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes.
1
0, 40, 1220, 23640, 368421, 4703562, 50473056, 474255829, 4047341159, 32112086692, 239321493757, 1678998378973, 11080464577870, 68753466828933, 401430915176013, 2209957957528646, 11503598362204972, 56799460197673429
OFFSET
1,2
COMMENTS
Column 4 of A278385.
FORMULA
Empirical polynomial of degree 63 (see link above)
EXAMPLE
Some solutions for n=4
..1..0..0..0. .1..1..1..0. .1..1..1..0. .1..1..0..1. .1..0..1..0
..1..1..0..1. .1..0..0..1. .1..1..1..0. .1..0..1..1. .1..1..1..1
..0..1..1..1. .1..0..1..1. .0..1..0..0. .1..1..1..0. .0..1..0..1
..1..1..0..0. .1..0..1..1. .1..0..1..1. .1..1..1..1. .1..0..1..0
CROSSREFS
Cf. A278385.
Sequence in context: A331350 A061650 A006101 * A251202 A239189 A188253
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 20 2016
STATUS
approved