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 A210822 Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in lower triangle row major order 0
 0, 16, 1087, 177647, 81795421, 108046374072, 410104028479299, 4472498652495173605, 140150219505027600078339, 12618876507902926558407977689, 3264615282814988282656326026638915 (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..2..1....0..1..3..1....0..1..3..0....0..1..1..0....0..1..1..0 ..1..2..3..2....1..2..1..0....1..2..0..2....1..2..0..3....1..2..0..2 ..2..3..0..2....3..1..3..0....3..0..3..2....1..0..3..2....1..0..3..1 ..1..2..2..1....1..0..0..1....0..2..2..1....0..3..2..1....0..2..1..2 CROSSREFS Sequence in context: A266066 A232571 A203096 * A265622 A144915 A209541 Adjacent sequences: A210819 A210820 A210821 * A210823 A210824 A210825 KEYWORD nonn AUTHOR R. H. Hardin Mar 27 2012 STATUS approved

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Last modified December 7 23:30 EST 2023. Contains 367662 sequences. (Running on oeis4.)