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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 0
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

..2.2.0..1.0.2..0.3.3..2.0.0..2.3.4..2.0.0..2.2.3..2.1.3..2.3.0..2.3.1..2.0.1

CROSSREFS

Sequence in context: A192837 A204077 A194537 * A194539 A146547 A274703

Adjacent sequences:  A194535 A194536 A194537 * A194539 A194540 A194541

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 28 2011

STATUS

approved

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Last modified November 13 19:25 EST 2018. Contains 317149 sequences. (Running on oeis4.)