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A001443 Number of strong starters in cyclic group of order 2n+1. 1
0, 0, 2, 0, 4, 8, 32, 224, 800, 6660, 27554, 158680, 1201626, 9415980, 76761968, 672858900, 6015305136, 59514095596 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

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

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

LINKS

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

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

CROSSREFS

Cf. A006205.

Sequence in context: A115780 A101189 A295321 * A195287 A070015 A021492

Adjacent sequences:  A001440 A001441 A001442 * A001444 A001445 A001446

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

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

STATUS

approved

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Last modified April 5 10:28 EDT 2020. Contains 333239 sequences. (Running on oeis4.)