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A006780 Number of n-step spirals on cubic lattice.
(Formerly M4163)
2
1, 6, 24, 90, 324, 1166, 4138, 14730, 51992, 183898, 646980, 2279702, 8002976, 28127418, 98585096, 345848306, 1210704274, 4241348770, 14833284544 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

A. J. Guttmann and K. J. Wallace, On three-dimensional spiral anisotropic self-avoiding walks, J. Phys. A 18 (1985), L1049-L1054.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

G. Szekeres and A. J. Guttmann, Spiral self-avoiding walks on the triangular lattice, J. Phys. A 20 (1987), 481-493.

LINKS

Table of n, a(n) for n=0..18.

CROSSREFS

Sequence in context: A249976 A181618 A002919 * A001352 A155602 A179716

Adjacent sequences:  A006777 A006778 A006779 * A006781 A006782 A006783

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 22 05:11 EST 2019. Contains 319353 sequences. (Running on oeis4.)