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 A210830 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in lower triangle row major order 0
 2, 21, 836, 82199, 19344902, 10875989293, 14610163237856, 46893874745455135, 359629516402454786058, 6589801210450509598836041 (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..1..1..2....0..1..3..1....0..1..3..3....0..1..1..1....0..1..1..0 ..1..2..3..3....1..2..3..0....1..2..1..2....1..2..0..3....1..2..0..2 ..1..3..0..1....3..3..1..0....3..1..0..1....1..0..1..3....1..0..3..2 ..2..3..1..3....1..0..0..2....3..2..1..3....1..3..3..0....0..2..2..0 CROSSREFS Sequence in context: A342267 A113083 A174964 * A139164 A019994 A015193 Adjacent sequences: A210827 A210828 A210829 * A210831 A210832 A210833 KEYWORD nonn AUTHOR R. H. Hardin Mar 27 2012 STATUS approved

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Last modified October 4 07:36 EDT 2023. Contains 365873 sequences. (Running on oeis4.)