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

3, 28, 448, 12224, 582976, 48752256, 7203712512, 1886877853824, 879055341435904, 730130107330428544, 1083358734004347000832, 2876398810379833776444288, 13684686772466101305358053248, 116800507250117278015849838491776

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 * A060545 A108288 A327362

Adjacent sequences: A210851 A210852 A210853 * A210855 A210856 A210857

Keyword

nonn

Author

R. H. Hardin Mar 28 2012

Status

approved