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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
OFFSET
1,3
CROSSREFS
This is the k=1 column (the second column) of the triangle in A217209.
Sequence in context: A077865 A117353 A103422 * A351983 A247322 A348473
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 01 2012
STATUS
approved