A210837 - OEIS

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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

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

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