A005368 Occurrences of principal character.
1, 0, 1, 3, 6, 15, 42, 109, 320, 979, 3137, 10603, 37728, 140423, 546859, 2220294, 9374309, 41059926, 186149869, 871717073, 4208841555, 20917405824, 106849492793
Offset: 0
References
- N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Links
- Russell Merris and William Watkins, Tensors and graphs, SIAM J. Algebraic Discrete Methods 4 (1983), no. 4, 534-547.
Crossrefs
Extensions
a(7)-a(17) from Andrey Zabolotskiy, Sep 10 2018
a(18)-a(22) from Sean A. Irvine, Mar 02 2022