A217210 Number of strings of n 2's and 3's having a tail of length 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

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 * A351983 A247322 A348473

Adjacent sequences: A217207 A217208 A217209 * A217211 A217212 A217213

Keyword

nonn

Author

N. J. A. Sloane, Oct 01 2012

Status

approved