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A194535 Number of lower triangles of an n X n 0..3 array with new values introduced in row major order 0..3 and no element equal to more than one horizontal or vertical neighbor 1
1, 4, 116, 16556, 7721920, 11525456507, 54979732214116, 838387866908847478, 40866499579695484000499, 6367568042830726931523028453, 3171485572844765112503023656979959 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A194540

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..12

EXAMPLE

Some solutions for 3X3

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

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

..3.3.0..0.0.2..2.3.1..0.3.0..2.0.1..3.2.1..0.3.1..2.1.3..2.1.2..2.0.1..2.2.1

CROSSREFS

Sequence in context: A206689 A198080 A272158 * A030255 A146508 A096464

Adjacent sequences:  A194532 A194533 A194534 * A194536 A194537 A194538

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 28 2011

STATUS

approved

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Last modified November 15 04:00 EST 2018. Contains 317225 sequences. (Running on oeis4.)