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 A194780 Number of lower triangles of a (2n)X(2n) 0..n array with new values introduced in row major order 0..n and no element unequal to more than one horizontal or vertical neighbor 0
 3, 17, 105, 672, 4490, 31466, 231445, 1784788, 14404218, 121421075, 1066906979, 9753108510, 92586250999, 911156724048 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A194778 LINKS Table of n, a(n) for n=1..14. EXAMPLE All solutions for n=2 containing a 2 ..0........0........0........0........0 ..0.0......1.1......1.1......0.1......1.1 ..1.1.1....1.1.1....1.1.2....0.1.1....1.1.1 ..1.1.1.2..1.1.1.2..1.1.2.2..0.1.1.2..2.2.2.2 CROSSREFS Sequence in context: A264963 A036551 A162479 * A372462 A074563 A077145 Adjacent sequences: A194777 A194778 A194779 * A194781 A194782 A194783 KEYWORD nonn AUTHOR R. H. Hardin Sep 02 2011 STATUS approved

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Last modified August 12 09:35 EDT 2024. Contains 375092 sequences. (Running on oeis4.)