OFFSET
1,3
REFERENCES
CRC Handbook of Combinatorial Designs, 1996, p. 460.
LINKS
Jeppe Winther Larsen, Counting the Skolem sequences using inclusion-exclusion, 2009
EXAMPLE
For n = 3, there are 2 solutions: 1 1 2 3 2 0 3 and 3 1 1 3 2 0 2.
CROSSREFS
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