cp's OEIS Frontend

A216337 Number of horizontal and antidiagonal neighbor colorings of the even squares of an nX7 array with new integer colors introduced in row major order.

%I A216337 #6 Jul 22 2025 23:30:55
%S A216337 5,136,61915,12297870,33093354906,18383343930862,148049849072167133,
%T A216337 166176901557427161788,2985013124775648539788601,
%U A216337 5737167226254078112766902750,194564626464285317322710261641286
%N A216337 Number of horizontal and antidiagonal neighbor colorings of the even squares of an nX7 array with new integer colors introduced in row major order.
%C A216337 Column 7 of A216338
%H A216337 R. H. Hardin, <a href="/A216337/b216337.txt">Table of n, a(n) for n = 1..17</a>
%e A216337 Some solutions for n=4
%e A216337 ..0..x..1..x..2..x..3....0..x..1..x..2..x..0....0..x..1..x..2..x..3
%e A216337 ..x..0..x..4..x..5..x....x..0..x..3..x..4..x....x..0..x..3..x..1..x
%e A216337 ..1..x..0..x..1..x..6....1..x..0..x..1..x..0....1..x..2..x..3..x..1
%e A216337 ..x..7..x..2..x..4..x....x..5..x..2..x..5..x....x..4..x..5..x..6..x
%K A216337 nonn
%O A216337 1,1
%A A216337 _R. H. Hardin_ Sep 04 2012