|
%I #4 Nov 18 2016 06:40:54
%S 1,94,1678,19854,186987,1548002,11947350,87562135,605431820,
%T 3905165468,23355599964,129475795828,667503759881,3215875683718,
%U 14555156486463,62204964640341,252211338710097,974245904884957,3598868691539578
%N Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
%C Column 4 of A278325.
%H R. H. Hardin, <a href="/A278321/b278321.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical polynomial of degree 47 (see link above)
%e Some solutions for n=4
%e ..0..1..1..0. .1..1..0..0. .0..1..0..1. .0..1..0..1. .1..1..0..1
%e ..1..0..1..1. .0..0..0..0. .0..1..1..1. .0..1..0..1. .1..1..0..1
%e ..0..1..0..0. .1..1..1..1. .1..1..1..0. .0..0..0..0. .1..1..0..1
%e ..1..1..0..1. .1..1..1..1. .0..1..1..1. .0..0..0..0. .0..0..1..1
%Y Cf. A278325.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 18 2016
| 