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 A218875 Triangle read by rows: T(n,k) (1 <= k <= n) = number of robust primitive binary sequences of length n and curling number k. 3
 2, 2, 0, 4, 2, 0, 6, 4, 2, 0, 10, 12, 4, 2, 0, 20, 20, 8, 4, 2, 0, 36, 52, 20, 8, 4, 2, 0, 72, 98, 36, 16, 8, 4, 2, 0, 142, 214, 76, 36, 16, 8, 4, 2, 0, 280, 414, 160, 68, 32, 16, 8, 4, 2, 0, 560, 870, 326, 140, 68, 32, 16, 8, 4, 2, 0, 1114, 1720, 640, 276, 132, 64, 32, 16, 8, 4, 2, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 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, First 36 rows of table FORMULA The triangle in A218869 is the sum of triangles A218875 and A218876. EXAMPLE Triangle begins: [2], [2, 0], [4, 2, 0], [6, 4, 2, 0], [10, 12, 4, 2, 0], [20, 20, 8, 4, 2, 0], [36, 52, 20, 8, 4, 2, 0], [72, 98, 36, 16, 8, 4, 2, 0], [142, 214, 76, 36, 16, 8, 4, 2, 0], [280, 414, 160, 68, 32, 16, 8, 4, 2, 0], ... CROSSREFS Cf. A216955, A218869, A218876. First column is A216958. Sequence in context: A253243 A201396 A005881 * A218869 A144458 A098268 Adjacent sequences:  A218872 A218873 A218874 * A218876 A218877 A218878 KEYWORD nonn,tabl AUTHOR N. J. A. Sloane, Nov 15 2012 STATUS approved

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Last modified January 20 12:19 EST 2019. Contains 319330 sequences. (Running on oeis4.)