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A203979 Number of (n+1)X4 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order 1
96, 864, 7776, 69984, 629856, 5668704, 51018336, 459165024, 4132485216, 37192366944, 334731302496, 3012581722464, 27113235502176, 244019119519584, 2196172075676256, 19765548681086304, 177889938129776736 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A203984
LINKS
FORMULA
Empirical: a(n) = 96*9^(n-1)
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..1..2..2....0..0..1..2....0..1..0..2....0..1..0..0
..1..2..2..1....2..1..0..0....2..2..1..0....2..2..0..1....2..2..2..1
..1..0..0..0....2..1..2..1....0..0..1..0....1..1..0..1....0..0..0..0
..1..2..2..1....0..0..2..0....2..2..2..2....2..2..2..1....1..1..1..1
..0..0..0..0....1..1..1..0....0..0..1..1....0..0..0..0....2..2..2..2
CROSSREFS
Sequence in context: A202890 A173615 A103846 * A296960 A202583 A027628
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2012
STATUS
approved

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Last modified May 26 05:37 EDT 2024. Contains 372807 sequences. (Running on oeis4.)