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A217210 Number of strings of n 2's and 3's having a tail of length 1. 1
0, 1, 2, 5, 9, 18, 34, 71, 139, 280, 555, 1119, 2228, 4462, 8907, 17835, 35634, 71288, 142507, 285077, 570013, 1140102, 2279924, 4560040, 9119516, 18239335, 36477548, 72955801, 145909351, 291819915, 583635336, 1167273283 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

CROSSREFS

This is the k=1 column (the second column) of the triangle in A217209.

Sequence in context: A077865 A117353 A103422 * A247322 A097281 A321408

Adjacent sequences:  A217207 A217208 A217209 * A217211 A217212 A217213

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 01 2012

STATUS

approved

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Last modified October 19 15:50 EDT 2019. Contains 328223 sequences. (Running on oeis4.)