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A210908 Number of n X n 0..2 symmetric matrices with every element equal to zero, one or two horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order. 1
1, 5, 113, 7778, 1470886, 763792392, 1088811691432, 4261103470283404, 45779341641362650312, 1350192169041023566949256, 109319888150289081250021299116, 24298544040660143463576152678947136 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
Some solutions for n=4
..0..1..2..1....0..1..1..0....0..0..1..0....0..1..2..1....0..1..1..2
..1..1..2..2....1..0..0..0....0..1..0..1....1..1..2..0....1..2..2..0
..2..2..1..2....1..0..1..1....1..0..1..2....2..2..1..2....1..2..2..0
..1..2..2..2....0..0..1..0....0..1..2..2....1..0..2..0....2..0..0..0
CROSSREFS
Sequence in context: A009678 A009691 A194570 * A355074 A053712 A325914
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 29 2012
STATUS
approved

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Last modified March 3 04:18 EST 2024. Contains 370499 sequences. (Running on oeis4.)