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 A210836 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, three or four distinct values, and new values 0..3 introduced in lower triangle row major order 0
 2, 25, 1479, 258581, 130785357, 190865489427, 803986116428812, 9774577782495936824, 342988668346099489744721, 34737069299078187196492748928 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..10. EXAMPLE Some solutions for n=3 ..0..0..1..3....0..1..3..2....0..1..2..1....0..1..2..2....0..1..3..0 ..0..0..2..2....1..2..0..3....1..2..0..3....1..2..0..3....1..2..3..1 ..1..2..1..3....3..0..1..0....2..0..1..1....2..0..3..1....3..3..0..0 ..3..2..3..0....2..3..0..3....1..3..1..1....2..3..1..2....0..1..0..0 CROSSREFS Sequence in context: A204234 A203747 A278273 * A088816 A323589 A141415 Adjacent sequences: A210833 A210834 A210835 * A210837 A210838 A210839 KEYWORD nonn AUTHOR R. H. Hardin Mar 27 2012 STATUS approved

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Last modified June 1 02:46 EDT 2023. Contains 363068 sequences. (Running on oeis4.)