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A210854
Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having two distinct values, and new values 0..2 introduced in lower triangle row major order
1
3, 28, 448, 12224, 582976, 48752256, 7203712512, 1886877853824, 879055341435904, 730130107330428544, 1083358734004347000832, 2876398810379833776444288, 13684686772466101305358053248, 116800507250117278015849838491776
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..2....0..0..1..0....0..0..1..2....0..1..2..2....0..0..1..0
..1..1..0..2....0..1..1..1....0..1..1..1....1..1..1..1....0..1..1..0
..0..0..0..2....1..1..0..0....1..1..0..1....2..1..2..1....1..1..0..0
..2..2..2..2....0..1..0..1....2..1..1..0....2..1..1..2....0..0..0..1
CROSSREFS
Sequence in context: A376034 A319369 A340789 * A060545 A108288 A327362
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 28 2012
STATUS
approved