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A243728 Number of length n+2 0..9 arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..9 introduced in 0..9 order 1
3, 6, 12, 25, 53, 116, 259, 594, 1389, 3323, 8095, 20113, 50814, 130632, 341034, 904331, 2432412, 6636111, 18345401, 51381503, 145690844, 418123477, 1213876444, 3563936878, 10577119368, 31722511379, 96106797203, 294036698701 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 9 of A243729
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) -203*a(n-3) +336*a(n-4) +1869*a(n-5) -4354*a(n-6) -9225*a(n-7) +25044*a(n-8) +27419*a(n-9) -76104*a(n-10) -53277*a(n-11) +119771*a(n-12) +68688*a(n-13) -77292*a(n-14) -45360*a(n-15)
EXAMPLE
Some solutions for n=6
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....0....1....0....1....0....0....1....1....1....1....0....1....0....0
..1....1....1....0....1....0....1....1....0....0....1....1....1....1....1....1
..2....2....0....1....1....1....1....0....1....0....0....0....1....2....1....0
..1....2....1....0....2....0....2....0....1....1....1....0....2....1....2....1
..2....3....0....0....1....1....1....2....2....1....0....2....2....2....1....1
..2....2....0....1....2....0....2....2....1....0....1....0....3....2....1....0
..0....3....1....1....1....1....2....1....2....1....0....2....2....1....3....0
CROSSREFS
Sequence in context: A243725 A243726 A243727 * A243721 A280109 A099445
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 09 2014
STATUS
approved

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Last modified February 24 11:15 EST 2024. Contains 370303 sequences. (Running on oeis4.)