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 A251234 Number of (n+1) X (6+1) 0..3 arrays with every 2 X 2 subblock summing to 6 and no 2 X 2 subblock having exactly two nonzero entries. 1
 8982, 14786, 26224, 50570, 103926, 225936, 514950, 1222090, 3000620, 7579486, 19600410, 51681580, 138503810, 376340486, 1034918936, 2876538978, 8073696214, 22868351328, 65337863366, 188245777530, 546776950780, 1600766400046 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A251236. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 13*a(n-1) -63*a(n-2) +122*a(n-3) +13*a(n-4) -371*a(n-5) +317*a(n-6) +308*a(n-7) -370*a(n-8) -144*a(n-9) +128*a(n-10) +48*a(n-11). EXAMPLE Some solutions for n=4: ..1..3..0..2..0..3..0....3..1..2..2..3..1..2....3..1..3..1..2..0..3 ..1..1..2..2..2..1..2....0..2..1..1..0..2..1....1..1..1..1..2..2..1 ..3..1..2..0..2..1..2....2..2..1..3..2..2..1....2..2..2..2..1..1..2 ..1..1..2..2..2..1..2....1..1..2..0..1..1..2....2..0..2..0..3..1..2 ..2..2..1..1..1..2..1....2..2..1..3..2..2..1....3..1..3..1..2..0..3 CROSSREFS Cf. A251236. Sequence in context: A234755 A230839 A339348 * A144126 A263062 A215198 Adjacent sequences: A251231 A251232 A251233 * A251235 A251236 A251237 KEYWORD nonn AUTHOR R. H. Hardin, Nov 30 2014 STATUS approved

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Last modified August 13 01:30 EDT 2024. Contains 375113 sequences. (Running on oeis4.)