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A222320 Number of open Skolem sequences of order n. 0
1, 2, 4, 8, 20, 52, 146, 430, 1306, 4176, 13832, 47452, 169044, 619672, 234225 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 15 16:02 EDT 2021. Contains 343920 sequences. (Running on oeis4.)