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Number of n X 3 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
1

%I #6 May 08 2023 07:31:38

%S 1,264,9354,201539,3576730,58069125,859516239,11336482734,

%T 132278417831,1373129978107,12814886712893,108729955660224,

%U 847319762234831,6118517452942163,41248241307153636,261266409367793037

%N Number of n X 3 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

%C Column 3 of A278414.

%H R. H. Hardin, <a href="/A278409/b278409.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A278409/a278409.txt">Empirical polynomial of degree 80</a>

%F Empirical polynomial of degree 80 (see link above).

%e Some solutions for n=3

%e ..2..0..0. .1..2..0. .1..0..0. .1..0..1. .1..1..1. .1..2..0. .0..2..2

%e ..2..1..1. .2..1..1. .2..1..2. .2..1..0. .2..1..2. .2..0..2. .2..2..1

%e ..0..0..1. .2..1..0. .2..0..1. .0..2..1. .1..1..1. .1..1..2. .0..1..2

%Y Cf. A278414.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 21 2016