A007402 No-3-in-line problem for equilateral triangle array of side n. (Formerly M0123)

1, 1, 2, 1, 2, 15, 1, 5, 7, 971, 20, 276

Offset

1,3

References

R. H. Buchholz, personal communication.

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=1..12.

R. G. Wilson, V, Letters to N. J. A. Sloane

R. G. Wilson, V, Letter to N. J. A. Sloane, Oct. 1993

Crossrefs

Sequence in context: A048296 A016542 A242085 * A334505 A251731 A058260

Adjacent sequences: A007399 A007400 A007401 * A007403 A007404 A007405

Keyword

nonn,nice

Author

N. J. A. Sloane, Mira Bernstein

Status

approved