A210837 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two, three or four distinct values, and new values 0..3 introduced in lower triangle row major order

4, 157, 34848, 32087451, 116765092684, 1675364225009869, 94777043088521233200, 21139495208799287816738519, 18590180528543794272963690721687, 64457007550068881643906256762264646455

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for n=3
..0..1..3..0....0..1..0..1....0..1..3..3....0..1..1..0....0..1..1..1
..1..2..3..2....1..1..0..0....1..2..3..0....1..0..0..0....1..2..2..2
..3..3..1..3....0..0..2..1....3..3..2..3....1..0..1..2....1..2..0..0
..0..2..3..1....1..0..1..0....3..0..3..2....0..0..2..0....1..2..0..1

Crossrefs

Sequence in context: A202298 A003736 A354285 * A289231 A204680 A205156

Adjacent sequences: A210834 A210835 A210836 * A210838 A210839 A210840

Keyword

nonn

Author

R. H. Hardin Mar 27 2012

Status

approved