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A194575 Number of lower triangles of an n X n 0..7 array with new values introduced in row major order 0..7 and no element equal to more than two horizontal or vertical neighbors 0
1, 5, 194, 110064, 1237399743, 230795314260831, 443383367826271457152, 7112925826561472131385895933 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A194576

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

..0.0....1.0....0.1....1.2....1.0....1.2....0.1....0.0....0.1....0.1....1.2

..1.1.1..2.2.0..2.2.1..1.1.0..1.1.2..1.1.2..2.3.1..1.2.0..0.1.2..1.0.1..2.2.1

CROSSREFS

Sequence in context: A068793 A194573 A194574 * A240772 A142927 A114351

Adjacent sequences:  A194572 A194573 A194574 * A194576 A194577 A194578

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 29 2011

STATUS

approved

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Last modified April 22 11:46 EDT 2019. Contains 322330 sequences. (Running on oeis4.)