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 A240595 Look-and-Say table, where in row(n+1) the sorted list of distinct terms of row(n) is preceded by the list of numbers of their occurrences. 1
 1, 1, 1, 2, 1, 1, 1, 1, 2, 3, 1, 1, 2, 2, 1, 1, 1, 2, 3, 3, 2, 1, 1, 2, 3, 2, 2, 2, 1, 2, 3, 1, 4, 1, 1, 2, 3, 3, 1, 1, 1, 1, 2, 3, 4, 4, 1, 2, 1, 1, 2, 3, 4, 3, 2, 1, 2, 1, 2, 3, 4, 2, 3, 2, 1, 1, 2, 3, 4, 2, 3, 2, 1, 1, 2, 3, 4, 2, 3, 2, 1, 1, 2, 3, 4, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS For n > 13: row(n) = row(13), see example. LINKS Eric Weisstein's World of Mathematics, Look and Say Sequence Wikipedia, Look-and-say sequence EXAMPLE .  1: [1] -> 1x1 -> [1 | 1] -> row(2) .  2: [1,1] -> 2x1 -> [2 | 1] -> row(3) .  3: [2,1] -> 1x1, 1x2 -> [1,1 | 1,2] -> row(4) .  4: [1,1,1,2] -> 3x1, 1x2 -> [3,1 | 1,2] -> row(5) .  5: [3,1,1,2] -> 2x1, 1x2, 1x3 -> [2,1,1 | 1,2,3] -> row(6) .  6: [2,1,1,1,2,3] -> 3x1, 2x2, 1x3 -> [3,2,1 | 1,2,3] -> row(7) .  7: [3,2,1,1,2,3] -> 2x1, 2x2, 2x3 -> [2,2,2 | 1,2,3] -> row(8) .  8: [2,2,2,1,2,3] -> 1x1, 4x2, 1x3 -> [1,4,1 | 1,2,3] -> row(9) .  9: [1,4,1,1,2,3] -> 3x1, 1x2, 1x3, 1x4 -> [3,1,1,1 | 1,2,3] -> row(10) . 10: [3,1,1,1,1,2,3,4] -> 4x1, 1x2, 2x3, 1x4 -> [4,1,2,1 | 1,2,3,4] . 11: [4,1,2,1,1,2,3,4] -> 3x1, 2x2, 1x3, 2x4 -> [3,2,1,2 | 1,2,3,4] . 12: [3,2,1,2,1,2,3,4] -> 2x1, 3x2, 2x3, 1x4 -> [2,3,2,1 | 1,2,3,4] . 13: [2,3,2,1,1,2,3,4] -> 2x1, 3x2, 2x3, 1x4 -> [2,3,2,1 | 1,2,3,4] . 14: [2,3,2,1,1,2,3,4] = row(13). PROG (Haskell) import Data.List (sort, group) a240595 n k = a240595_tabf !! (n-1) !! (k-1) a240595_row n = a240595_tabf !! (n-1) a240595_tabf = iterate f [1] where    f xs = concat [map length zss, map head zss]           where zss = group \$ sort xs CROSSREFS Cf. A034002. Sequence in context: A303929 A303694 A194673 * A083671 A201913 A232463 Adjacent sequences:  A240592 A240593 A240594 * A240596 A240597 A240598 KEYWORD nonn,tabf AUTHOR Reinhard Zumkeller, Apr 08 2014 STATUS approved

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Last modified May 28 18:24 EDT 2022. Contains 354122 sequences. (Running on oeis4.)