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A217932 a(n) = total number of binary sequences S of length n and curling number k (so S = XY^k) in which Y can be taken to have length 1. 1
2, 4, 8, 14, 28, 52, 104, 202, 402, 794, 1588, 3152, 6304, 12572, 25136, 50198, 100396, 200636, 401272, 802260, 1604488, 3208416, 6416832, 12832482, 25664962, 51327702, 102655278, 205306104, 410612208, 821215304, 1642430608, 3284843468 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..32.

Index entries for sequences related to curling numbers

EXAMPLE

Taking the alphabet to be {0,1}, the 14 sequences of length 14 are **10 (k=1), *100 (k=2), 1000 (k=3) and their complements, for a total of 2(4+2+1) = 14 (here * = 0 or 1).

CROSSREFS

Cf. A217933.

Sequence in context: A068912 A164176 A325860 * A215978 A018086 A004651

Adjacent sequences:  A217929 A217930 A217931 * A217933 A217934 A217935

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 17 2012

STATUS

approved

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Last modified September 24 17:33 EDT 2021. Contains 347651 sequences. (Running on oeis4.)