A005368 Occurrences of principal character. (Formerly M2589)

1, 0, 1, 3, 6, 15, 42, 109, 320, 979, 3137, 10603, 37728, 140423, 546859, 2220294, 9374309, 41059926, 186149869, 871717073, 4208841555, 20917405824, 106849492793

Offset

0,4

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..22.

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

Crossrefs

Cf. A259976.

Possibly row n = 2 of A331509.

Sequence in context: A152799 A140824 A001433 * A067771 A289678 A337326

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

a(18)-a(22) from Sean A. Irvine, Mar 02 2022

Status

approved