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 A216813 Sum of tail length of S over all 2^n strings S consisting of n 2's and 3's. 4
 0, 3, 6, 18, 39, 96, 201, 582, 1220, 2590, 5345, 10919, 21859, 44167, 88629, 178050, 356598, 715084, 1431514, 2866876, 5736311, 11480839, 22966942, 45949687, 91910241, 183852468, 367726473, 735517466, 1471078571, 2942286009, 5884661772, 11769583511, 23539346216, 47079214312, 94158788295 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS "Tail length" is defined in A216730. LINKS Benjamin Chaffin and N. J. A. Sloane, Table of n, a(n) for n = 1..40 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. FORMULA a(n) = A094005(n) - n*2^n. Up to n=32, the average tail length a(n)/2^n seems to be approaching a number around 2.74. CROSSREFS Cf. A094005, A216730. Sequence in context: A026532 A160505 A081150 * A181037 A222856 A007990 Adjacent sequences:  A216810 A216811 A216812 * A216814 A216815 A216816 KEYWORD nonn AUTHOR N. J. A. Sloane, Sep 18 2012 - Sep 21 2012, Oct 23 2012 STATUS approved

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Last modified October 22 00:52 EDT 2019. Contains 328315 sequences. (Running on oeis4.)