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A004076 Number of hooked Skolem sequences of order n. 1
0, 1, 2, 0, 0, 38, 124, 0, 0, 12808, 72648, 0, 0, 21878816, 168870048, 0, 0, 113071735648, 1105816948032, 0, 0, 1395701792232832 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
REFERENCES
CRC Handbook of Combinatorial Designs, 1996, p. 460.
LINKS
EXAMPLE
For n = 3, there are 2 solutions: 1 1 2 3 2 0 3 and 3 1 1 3 2 0 2.
CROSSREFS
Sequence in context: A073111 A229685 A230469 * A365974 A013369 A013416
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(15)-a(18) from Jeppe Winther Larsen (jwl(AT)itu.dk), Oct 12 2009
a(4)-a(18) confirmed, a(3) corrected by Fausto A. C. Cariboni, Apr 11 2017
a(19)-a(22) from Fausto A. C. Cariboni, Apr 25 2017
STATUS
approved

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Last modified June 13 05:35 EDT 2024. Contains 373366 sequences. (Running on oeis4.)