A278304 Number of nX3 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.

16, 294, 4558, 70795, 986014, 11557658, 114457714, 979384739, 7403239385, 50338674135, 312278286478, 1787165528059, 9519474270945, 47534286373117, 223836172954845, 998984714458061, 4243782348859492, 17223599427090859

Offset

1,1

Comments

Column 3 of A278309.

Links

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

R. H. Hardin, Empirical polynomial of degree 53

Formula

Empirical polynomial of degree 53 (see link above)

Example

Some solutions for n=4
..0..0..1. .0..0..0. .0..0..1. .0..1..2. .0..2..2. .0..2..2. .0..1..2
..0..2..1. .2..0..2. .1..0..0. .1..2..2. .0..0..1. .2..0..2. .1..1..0
..2..0..2. .2..2..2. .1..0..0. .0..1..0. .0..1..1. .1..0..1. .2..2..0
..0..0..2. .2..2..2. .1..0..1. .0..1..1. .1..1..2. .2..0..1. .0..1..1

Crossrefs

Cf. A278309.

Sequence in context: A372172 A183886 A230341 * A298192 A299086 A299342

Adjacent sequences: A278301 A278302 A278303 * A278305 A278306 A278307

Keyword

nonn

Author

R. H. Hardin, Nov 17 2016

Status

approved