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A194891 Number of lower triangles of an n X n 0..6 array with new values introduced in row major order 0..6 and no two horizontal or vertical neighbors of any element equal 0
1, 3, 34, 5249, 7418424, 41521783200, 788547395813440 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 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

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

..2.2.3....1.3.4....2.3.0....2.3.0....1.3.0....3.3.4....2.3.0....2.3.4

..1.4.5.6..2.0.0.2..4.4.5.2..0.4.1.2..2.4.4.2..2.0.4.1..1.4.2.3..2.3.0.5

CROSSREFS

Sequence in context: A102104 A194890 A197434 * A194892 A182382 A222787

Adjacent sequences:  A194888 A194889 A194890 * A194892 A194893 A194894

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2011

STATUS

approved

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Last modified May 17 09:20 EDT 2022. Contains 353741 sequences. (Running on oeis4.)