A222320 Number of open Skolem sequences of order n.

1, 2, 4, 8, 20, 52, 146, 430, 1306, 4176, 13832, 47452, 169044, 619672, 234225

Offset

1,2

Links

Table of n, a(n) for n=1..15.

S. Burrill and L. Yen, Constructing Skolem sequences via generating trees, arXiv preprint arXiv:1301.6424, 2013

Crossrefs

Cf. A004075.

Sequence in context: A115219 A078160 A218088 * A089976 A000980 A123611

Adjacent sequences: A222317 A222318 A222319 * A222321 A222322 A222323

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 18 2013

Status

approved