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 A269498 Number of length-7 0..n arrays with no repeated value differing from the previous repeated value by one. 1
 66, 1609, 13946, 71115, 263794, 791381, 2039274, 4686391, 9847970, 19258689, 35501146, 62284739, 104779986, 170013325, 267327434, 408912111, 610410754, 891607481, 1277199930, 1797662779, 2490207026, 3399840069, 4580531626 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 7 of A269494. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = n^7 + 7*n^6 + 21*n^5 + 15*n^4 + 7*n^3 + 17*n^2 - n - 1. Empirical: x*(66 +1081*x +2922*x^2 +903*x^3 -122*x^4 +207*x^5 -18*x^6 +x^7) / (x-1)^8 . - R. J. Mathar, Mar 03 2016 EXAMPLE Some solutions for n=4 ..1. .1. .3. .3. .1. .0. .3. .2. .2. .2. .2. .2. .2. .4. .1. .2 ..1. .4. .1. .0. .4. .1. .2. .4. .1. .1. .4. .2. .2. .2. .0. .4 ..1. .3. .2. .2. .3. .4. .2. .4. .1. .2. .0. .0. .4. .3. .4. .4 ..3. .4. .0. .2. .4. .0. .1. .3. .3. .2. .3. .0. .3. .2. .1. .1 ..3. .0. .1. .3. .0. .4. .4. .1. .4. .0. .0. .2. .0. .2. .4. .0 ..1. .1. .0. .1. .4. .0. .0. .0. .3. .1. .0. .2. .3. .3. .3. .3 ..4. .4. .0. .3. .4. .3. .3. .4. .0. .4. .0. .1. .0. .4. .2. .4 CROSSREFS Cf. A269494. Sequence in context: A251047 A279889 A241799 * A133318 A197645 A270847 Adjacent sequences: A269495 A269496 A269497 * A269499 A269500 A269501 KEYWORD nonn AUTHOR R. H. Hardin, Feb 28 2016 STATUS approved

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Last modified February 4 10:27 EST 2023. Contains 360053 sequences. (Running on oeis4.)