A164763 - OEIS

A164763

Number of nX6 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value

225, 11786, 265155, 4434848, 63388030

(list; graph; refs; listen; history; text; internal format)

OFFSET

2,1

LINKS

Table of n, a(n) for n=2..6.

EXAMPLE

Some solutions for n=3

...1.1.2.2.2.2...1.1.2.2.2.2...1.1.1.2.2.2...1.1.1.2.2.2...1.1.2.2.2.2

...3.3.3.2.2.2...1.1.3.2.2.2...1.1.1.2.4.2...3.3.3.2.4.4...1.1.1.2.2.2

...3.3.3.3.4.4...3.3.3.4.4.4...3.3.3.3.4.4...3.3.3.4.4.4...3.3.3.4.4.4

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