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 A268954 Number of length-n 0..6 arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order. 1
 1, 2, 4, 12, 40, 154, 656, 3073, 15579, 84572, 485726, 2918103, 18146537, 115772922, 752410412, 4954432229, 32923518967, 220172576536, 1478770322954, 9961340359315, 67235635905765, 454423768826774, 3074025717951560 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 6 of A268956. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 27*a(n-1) -280*a(n-2) +1258*a(n-3) -781*a(n-4) -13833*a(n-5) +39878*a(n-6) +32104*a(n-7) -261136*a(n-8) +111564*a(n-9) +754544*a(n-10) -663920*a(n-11) -1052352*a(n-12) +1135872*a(n-13) +580608*a(n-14) -663552*a(n-15) for n>17 EXAMPLE Some solutions for n=8 ..0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0 ..1. .1. .1. .1. .1. .0. .0. .1. .1. .1. .1. .1. .1. .1. .1. .1 ..2. .2. .2. .0. .2. .1. .1. .2. .2. .2. .2. .0. .2. .2. .2. .2 ..3. .0. .3. .1. .3. .0. .2. .3. .3. .3. .1. .2. .1. .2. .0. .3 ..2. .2. .0. .2. .4. .1. .1. .0. .2. .3. .3. .1. .2. .1. .3. .4 ..3. .3. .1. .3. .0. .2. .0. .1. .1. .0. .1. .3. .3. .0. .4. .2 ..3. .0. .3. .1. .5. .3. .2. .3. .3. .0. .2. .2. .2. .1. .3. .1 ..4. .0. .0. .1. .0. .2. .3. .1. .1. .3. .3. .2. .2. .2. .4. .4 CROSSREFS Cf. A268956. Sequence in context: A215072 A326513 A268953 * A268955 A268010 A215073 Adjacent sequences: A268951 A268952 A268953 * A268955 A268956 A268957 KEYWORD nonn AUTHOR R. H. Hardin, Feb 16 2016 STATUS approved

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Last modified November 28 15:31 EST 2023. Contains 367419 sequences. (Running on oeis4.)