A278552 - OEIS

%I #6 Apr 30 2022 20:46:05

%S 2128,4880813,9647190761,19154084929099,35461508433808988,

%T 57645968168131680420,82417111259567413303205,

%U 106532272120153272376122742,128078032305270145287175836766

%N Number of n X 6 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

%C Column 6 of A278553.

%H R. H. Hardin, <a href="/A278552/b278552.txt">Table of n, a(n) for n = 1..18</a>

%e Some solutions for n=1

%e ..3..0..1..3..0..3. .2..1..0..1..1..2. .1..0..2..3..2..2. .2..3..0..2..2..0

%Y Cf. A278553.

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 23 2016