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 A218870 Triangle read by rows: T(n,k) = number of aperiodic binary sequences of length n with curling number <= k (1 <= k <= n). 3
 2, 2, 2, 4, 6, 6, 6, 10, 12, 12, 12, 24, 28, 30, 30, 20, 40, 48, 52, 54, 54, 40, 92, 112, 120, 124, 126, 126, 74, 174, 210, 226, 234, 238, 240, 240, 148, 362, 438, 474, 490, 498, 502, 504, 504, 286, 700, 860, 928, 960, 976, 984, 988, 990, 990, 572, 1448, 1776, 1916, 1984, 2016, 2032, 2040, 2044, 2046, 2046 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS S is aperiodic if it is not of the form S = T^m with m > 1. Rows are partial sums of rows of A218869. Final entries in rows form A027375. First column is A122536. LINKS B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, On Curling Numbers of Integer Sequences, arXiv:1212.6102, Dec 25 2012. B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, On Curling Numbers of Integer Sequences, Journal of Integer Sequences, Vol. 16 (2013), Article 13.4.3. N. J. A. Sloane, Rows 1 through 36 EXAMPLE Triangle begins: [2] [2, 2] [4, 6, 6] [6, 10, 12, 12] [12, 24, 28, 30, 30] [20, 40, 48, 52, 54, 54] [40, 92, 112, 120, 124, 126, 126] [74, 174, 210, 226, 234, 238, 240, 240] [148, 362, 438, 474, 490, 498, 502, 504, 504] [286, 700, 860, 928, 960, 976, 984, 988, 990, 990] [572, 1448, 1776, 1916, 1984, 2016, 2032, 2040, 2044, 2046, 2046] ... CROSSREFS Cf. A216955, A122536, A027375, A218869. Sequence in context: A170887 A103265 A008238 * A264869 A292728 A096575 Adjacent sequences:  A218867 A218868 A218869 * A218871 A218872 A218873 KEYWORD nonn,tabl AUTHOR N. J. A. Sloane, Nov 07 2012 STATUS approved

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Last modified May 26 09:37 EDT 2020. Contains 334620 sequences. (Running on oeis4.)