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 A266319 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west or north neighbor modulo 3 and the upper left element equal to 0. 2
 1, 2, 8, 30, 114, 414, 1561, 6227, 25712, 107071, 445688, 1860037, 7822241, 33194789, 141813340, 608193866, 2615140082, 11275208902, 48764348038, 211550067336, 920159818053, 4010884160844, 17515357388423, 76622591861147 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 3 of A266318. LINKS R. H. Hardin, Table of n, a(n) for n = 1..100 EXAMPLE Some solutions for n=4 ..0..0..2..1....0..2..2..1....0..0..2..1....0..0..2..1....0..2..1..1 ..2..2..1..0....2..2..1..0....0..2..2..1....0..2..2..1....2..1..0..0 ..2..1..1..0....1..1..0..0....0..2..1..1....2..1..1..0....2..1..0..2 CROSSREFS Cf. A266318. Sequence in context: A281949 A162551 A073663 * A155116 A133915 A150759 Adjacent sequences:  A266316 A266317 A266318 * A266320 A266321 A266322 KEYWORD nonn AUTHOR R. H. Hardin, Dec 27 2015 STATUS approved

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Last modified March 20 09:50 EDT 2019. Contains 321345 sequences. (Running on oeis4.)