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 A210835 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in lower triangle row major order 0
 1, 20, 1112, 177896, 81799424, 108046477848, 410104032824992, 4472498652789147680, 140150219505059739808160, 12618876507902932236881155440, 3264615282814988284277931558564176 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..11. EXAMPLE Some solutions for n=3 ..0..1..0..2....0..1..1..3....0..1..0..2....0..1..2..3....0..1..3..0 ..1..2..3..3....1..2..0..3....1..2..1..3....1..2..3..0....1..2..1..3 ..0..3..1..0....1..0..1..0....0..1..3..2....2..3..0..2....3..1..0..3 ..2..3..0..2....3..3..0..3....2..3..2..0....3..0..2..1....0..3..3..1 CROSSREFS Sequence in context: A224125 A324416 A177596 * A002305 A091535 A265654 Adjacent sequences: A210832 A210833 A210834 * A210836 A210837 A210838 KEYWORD nonn AUTHOR R. H. Hardin Mar 27 2012 STATUS approved

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Last modified June 5 19:44 EDT 2023. Contains 363138 sequences. (Running on oeis4.)