A194538 - OEIS

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A194538

Number of lower triangles of an n X n 0..6 array with new values introduced in row major order 0..6 and no element equal to more than one horizontal or vertical neighbor

1, 4, 132, 67377, 543350470, 40994098419294, 21253155706215768591, 71381360690596538575641162

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

OFFSET

1,2

COMMENTS

Column 6 of A194540

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 3X3

..0......0......0......0......0......0......0......0......0......0......0

..0.1....1.2....1.2....1.1....1.2....1.2....1.1....1.0....0.1....1.2....1.1