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 A210932 Number of n X n 0..3 symmetric matrices with every element equal to zero, one or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order 0
 1, 2, 55, 6136, 2300729, 2853666014, 11691775609193, 158256127017674737, 7077134333752159967353, 1045606338210715698434693227 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..10. EXAMPLE Some solutions for n=4 ..0..1..1..0....0..1..3..3....0..1..0..0....0..1..0..2....0..1..2..3 ..1..2..3..2....1..2..1..0....1..2..1..1....1..2..3..1....1..1..1..0 ..1..3..1..0....3..1..0..3....0..1..0..3....0..3..0..3....2..1..3..1 ..0..2..0..2....3..0..3..2....0..1..3..2....2..1..3..0....3..0..1..0 CROSSREFS Sequence in context: A024029 A134501 A210928 * A278842 A307025 A037176 Adjacent sequences: A210929 A210930 A210931 * A210933 A210934 A210935 KEYWORD nonn AUTHOR R. H. Hardin Mar 29 2012 STATUS approved

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Last modified December 3 05:03 EST 2023. Contains 367531 sequences. (Running on oeis4.)