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A194536 Number of lower triangles of an n X n 0..4 array with new values introduced in row major order 0..4 and no element equal to more than one horizontal or vertical neighbor 0
1, 4, 131, 43785, 79201795, 627974590650, 21399815343394998, 3132305932642809585983, 1969210116072259125767299138 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A194540

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for 3X3

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

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

..2.0.1..2.2.1..0.1.0..0.2.1..2.3.4..3.2.0..0.2.3..1.0.0..2.1.2..0.3.1..1.0.1

CROSSREFS

Sequence in context: A113253 A201977 A291172 * A064227 A353794 A204079

Adjacent sequences: A194533 A194534 A194535 * A194537 A194538 A194539

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 28 2011

STATUS

approved

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Last modified December 5 07:25 EST 2022. Contains 358582 sequences. (Running on oeis4.)