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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.

Index entries for sequences related to curling numbers

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 August 18 04:42 EDT 2017. Contains 290684 sequences.