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A194537 Number of lower triangles of an n X n 0..5 array with new values introduced in row major order 0..5 and no element equal to more than one horizontal or vertical neighbor 0
1, 4, 132, 62038, 286773762, 8096809998526, 1243336605965267360, 1026437889413641002431445 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 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

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

..2.0.3..0.2.1..3.1.1..3.2.1..3.0.1..3.4.1..1.0.1..2.0.1..0.0.2..1.0.2..1.0.0

CROSSREFS

Sequence in context: A252172 A192837 A204077 * A194538 A194539 A146547

Adjacent sequences:  A194534 A194535 A194536 * A194538 A194539 A194540

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 28 2011

STATUS

approved

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Last modified November 17 18:42 EST 2018. Contains 317276 sequences. (Running on oeis4.)