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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..15

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: A219532 A319369 A340789 * A108288 A060545 A327362

Adjacent sequences:  A210851 A210852 A210853 * A210855 A210856 A210857

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2012

STATUS

approved

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)