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

Author

N. J. A. Sloane, Oct 01 2012

Keywords

• nonn

Crossrefs

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