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A110971 Triangle T(n,k) (n>=2, 1<=k<=n-1) read by rows: row n gives epispectrum of a path P_n (see reference for precise definition). 2
1, 1, 1, 1, 2, 1, 1, 2, 4, 1, 1, 2, 6, 6, 1, 1, 2, 7, 11, 10, 1, 1, 2, 8, 14, 24, 14, 1, 1, 2, 9, 16, 35, 42, 22, 1, 1, 2, 10, 18, 45, 68, 81, 30, 1, 1, 2, 11, 20, 55, 89, 149, 138, 46, 1, 1, 2, 12, 22, 66, 110, 216, 282, 250, 62, 1, 1, 2, 13, 24, 78, 132, 285, 422, 577, 419 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

2,5

REFERENCES

M. A. Michels and U. Knauer, The congruence classes of paths and cycles, Discr. Math., 309 (2009), 5352-5359.

LINKS

Table of n, a(n) for n=2..77.

EXAMPLE

Triangle begins:

1

1 1

1 2 1

1 2 4 1

1 2 6 6 1

1 2 7 11 10 1

1 2 8 14 24 14 1

1 2 9 16 35 42 22 1

1 2 10 18 45 68 81 30 1

1 2 11 20 55 89 149 138 46 1

1 2 12 22 66 110 216 282 250 62 1

1 2 13 24 78 132 285 422 577 419 94 1

1 2 14 26 91 156 364 568 945 1070 732 126 1

CROSSREFS

Cf. A152086, A102699.

Sequence in context: A137855 A113143 A181802 * A136788 A136450 A131054

Adjacent sequences:  A110968 A110969 A110970 * A110972 A110973 A110974

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Sep 20 2009

STATUS

approved

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Last modified March 27 17:28 EDT 2017. Contains 284177 sequences.