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A194890 Number of lower triangles of an n X n 0..5 array with new values introduced in row major order 0..5 and no two horizontal or vertical neighbors of any element equal 0
1, 3, 34, 3936, 1797696, 2054111040, 5741390328960, 39210440893622016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A194893

LINKS

Table of n, a(n) for n=1..8.

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......1.2......1.2

..1.3.4....3.4.1....1.3.4....3.2.1....3.3.4....3.2.1....3.0.1....3.3.4

..0.0.4.1..5.5.2.0..2.3.5.2..0.0.1.2..0.1.1.0..3.4.5.0..3.4.4.3..2.1.0.5

CROSSREFS

Sequence in context: A324234 A337069 A102104 * A197434 A194891 A194892

Adjacent sequences:  A194887 A194888 A194889 * A194891 A194892 A194893

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2011

STATUS

approved

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Last modified May 25 05:58 EDT 2022. Contains 354048 sequences. (Running on oeis4.)