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A194539 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 one horizontal or vertical neighbor 0
1, 4, 132, 68106, 703256449, 108504879480483, 153378412416345530447 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A194540

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for 3X3

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

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

..2.2.0..0.2.0..0.2.3..1.3.3..2.3.1..0.3.4..1.3.2..2.0.3..2.2.1..0.3.2..0.1.2

CROSSREFS

Sequence in context: A204077 A194537 A194538 * A146547 A274703 A045482

Adjacent sequences:  A194536 A194537 A194538 * A194540 A194541 A194542

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 28 2011

STATUS

approved

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Last modified November 14 04:41 EST 2018. Contains 317161 sequences. (Running on oeis4.)