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A005368 Occurrences of principal character.
(Formerly M2589)
1
1, 0, 1, 3, 6, 15, 42, 109, 320, 979, 3137, 10603, 37728, 140423, 546859, 2220294, 9374309, 41059926 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

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=0..17.

Russell Merris and William Watkins, Tensors and graphs, SIAM J. Algebraic Discrete Methods 4 (1983), no. 4, 534-547.

CROSSREFS

Cf. A259976.

Sequence in context: A152799 A140824 A001433 * A067771 A289678 A056382

Adjacent sequences:  A005365 A005366 A005367 * A005369 A005370 A005371

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

a(7)-a(17) from Andrey Zabolotskiy, Sep 10 2018

STATUS

approved

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Last modified May 22 06:32 EDT 2019. Contains 323478 sequences. (Running on oeis4.)