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A006779 Number of n-step spirals on cubic lattice.
(Formerly M4121)
2
1, 6, 18, 54, 150, 426, 1158, 3204, 8682, 23724, 64194, 174378, 470856, 1274430, 3434826, 9272346, 24953004, 67230288, 180705126, 486152604, 1305430884 (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..20.

CROSSREFS

Sequence in context: A079843 A290582 A076941 * A003208 A174313 A002933

Adjacent sequences:  A006776 A006777 A006778 * A006780 A006781 A006782

KEYWORD

nonn,walk

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 18 16:40 EST 2019. Contains 319271 sequences. (Running on oeis4.)