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A194570 Number of lower triangles of an n X n 0..2 array with new values introduced in row major order 0..2 and no element equal to more than two horizontal or vertical neighbors 0
1, 5, 113, 7696, 1429748, 723276072, 996233663484, 3736289882783364, 38153100681294466800, 1060791108320009447746940, 80304497397124644777045379184, 16552355212984292716901267397576440 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 2 of A194576
LINKS
EXAMPLE
Some solutions for 3X3
..0......0......0......0......0......0......0......0......0......0......0
..1.1....1.2....1.0....0.1....1.2....0.0....0.1....1.1....1.2....1.1....1.0
..1.0.2..2.2.0..0.0.2..2.1.0..1.1.2..1.0.0..1.0.1..0.0.1..0.1.0..2.0.2..2.2.0
CROSSREFS
Sequence in context: A009603 A009678 A009691 * A210908 A355074 A053712
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 29 2011
STATUS
approved

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Last modified February 25 02:17 EST 2024. Contains 370308 sequences. (Running on oeis4.)