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 A217521 Base-4 state complexity of partitioned deterministic finite automaton (PDFA) for the periodic sequence (123...n)*. 5
 3, 3, 5, 10, 7, 21, 13, 27, 21, 55, 13, 78, 43, 30, 21, 68, 55, 171, 41, 63, 111, 253, 29, 250, 157, 243, 85, 406, 61, 155, 53, 165, 137, 210, 109, 666, 343, 234, 85, 410, 127, 301, 221, 270, 507, 1081, 53, 1029, 501, 204, 313, 1378, 487 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS Also the number of distinct words which can be formed from (123..n)* by taking every 4^k-th term from some initial index i, with i and k nonnegative. (Follows from Case 2 of Theorem 2.1) - Charlie Neder, Feb 28 2019 LINKS Charlie Neder, Table of n, a(n) for n = 2..128 Klaus Sutner and Sam Tetruashvili, Inferring Automatic Sequences. FORMULA a(n) <= A217519(n). In particular, it appears that a(n) = A217519(n)/2 whenever this result is an integer, and a(n) = A217519(n) for n = 2, 7, 14, 23, 31, 46, 47, 49, 62, 71, 89, 94, 98... - Charlie Neder, Feb 28 2019 CROSSREFS Cf. A217519, A217520, A247566-A247581. Sequence in context: A027170 A132775 A174102 * A252943 A294617 A320450 Adjacent sequences:  A217518 A217519 A217520 * A217522 A217523 A217524 KEYWORD nonn AUTHOR N. J. A. Sloane, Oct 07 2012 EXTENSIONS a(11)-a(20) added (see Inferring Automatic Sequences) by Vincenzo Librandi, Nov 18 2012 a(21)-a(54) from Charlie Neder, Feb 28 2019 STATUS approved

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Last modified January 29 14:07 EST 2020. Contains 331338 sequences. (Running on oeis4.)