

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
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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



KEYWORD

nonn,more


AUTHOR



EXTENSIONS

a(15)a(18) from Jeppe Winther Larsen (jwl(AT)itu.dk), Oct 12 2009


STATUS

approved



