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A006205 Number of inequivalent strong starters in cyclic group of order 2n+1.
(Formerly M0341)
1
0, 0, 1, 0, 2, 2, 4, 14, 52, 555, 1257, 7934, 66757, 336297, 2558894, 33642945, 250637748, 1653170339 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

REFERENCES

CRC Handbook of Combinatorial Designs, 1996, p. 469.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..18.

W. L. Kocay et al., On strong starters in cyclic groups, Discrete Math., 56 (1985), 45-60.

V. Linja-aho and Patric R. J. Östergård, Classification of starters, J. Combin. Math. Combin. Comput. 75 (2010), 153-159.

FORMULA

Cf. A001443.

CROSSREFS

Sequence in context: A019073 A153959 A308847 * A268073 A204685 A205161

Adjacent sequences:  A006202 A006203 A006204 * A006206 A006207 A006208

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

Better definition from Vesa Linja-aho (vesa.linja-aho(AT)tkk.fi), Jul 31 2008

Corrected and extended by Vesa Linja-aho (vesa.linja-aho(AT)tkk.fi), May 06 2009

STATUS

approved

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Last modified July 13 13:48 EDT 2020. Contains 335688 sequences. (Running on oeis4.)