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A194574 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 two horizontal or vertical neighbors 0
1, 5, 194, 109314, 1023490379, 103716766788027, 80480437921181928079, 438719474917484694724554104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 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....1.0....1.0....1.2....0.0....1.2....0.1....1.1....1.2....0.1

..1.0.2..0.0.1..2.1.1..2.3.3..0.1.0..1.2.3..3.2.3..0.1.0..2.3.1..3.0.0..2.1.3

CROSSREFS

Sequence in context: A194572 A068793 A194573 * A194575 A240772 A142927

Adjacent sequences:  A194571 A194572 A194573 * A194575 A194576 A194577

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 29 2011

STATUS

approved

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Last modified April 23 14:15 EDT 2019. Contains 322386 sequences. (Running on oeis4.)