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A194892 Number of lower triangles of an n X n 0..7 array with new values introduced in row major order 0..7 and no two horizontal or vertical neighbors of any element equal 0
1, 3, 34, 5556, 15005952, 282616583760, 24289270603904160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A194893

LINKS

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

EXAMPLE

Some solutions for 4X4

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

..1.2......1.2......1.2......1.2......1.2......1.2......0.1......1.2

..3.4.5....3.4.4....3.0.1....3.3.0....3.3.4....3.2.0....2.3.4....3.3.4

..2.4.6.7..0.0.1.1..4.5.2.0..2.4.4.2..4.5.1.3..3.4.0.3..1.5.5.0..5.0.1.3

CROSSREFS

Sequence in context: A194890 A197434 A194891 * A182382 A222787 A180126

Adjacent sequences:  A194889 A194890 A194891 * A194893 A194894 A194895

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2011

STATUS

approved

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Last modified May 17 03:25 EDT 2022. Contains 353727 sequences. (Running on oeis4.)