A217212 Number of sequences of 2's and 3's of length n with curling number 3.

0, 0, 2, 2, 4, 10, 20, 38, 82, 164, 328, 660, 1320, 2640, 5304, 10596, 21192, 42424, 84848, 169668, 339428, 678856, 1357712, 2715548, 5431096, 10862192, 21724746, 43449380, 86898760, 173798220, 347596440, 695192670

Offset

1,3

Links

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

Crossrefs

Column 3 of A216955. Cf. A122536, A217211.

Sequence in context: A152732 A308986 A100088 * A025244 A132824 A298898

Adjacent sequences: A217209 A217210 A217211 * A217213 A217214 A217215

Keyword

nonn

Author

N. J. A. Sloane, Oct 01 2012

Status

approved