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A071332 Number of polyiamonds with n cells that tile the plane. 11
1, 1, 1, 3, 4, 12, 23, 66, 139, 341, 567, 2034, 2495, 6354, 12908, 30261, 26556, 110145, 95967, 377523, 499672, 788726, 845130, 4998370, 3694670, 7406217, 13175181, 33557076, 22381719, 117770863 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

REFERENCES

M. Gardner, Tiling with Polyominoes, Polyiamonds and Polyhexes. Chap. 14 in Time Travel and Other Mathematical Bewilderments. New York: W. H. Freeman, pp. 175-187, 1988.

LINKS

Table of n, a(n) for n=1..30.

Joseph Myers, Polyiamond tiling

CROSSREFS

Equals A000577-A071333 and equals A070765-A071334, cf. A054359, A070766.

Sequence in context: A000206 A240737 A075223 * A006791 A111358 A111357

Adjacent sequences:  A071329 A071330 A071331 * A071333 A071334 A071335

KEYWORD

hard,nonn

AUTHOR

Joseph Myers, May 19 2002

EXTENSIONS

More terms from Joseph Myers, Nov 11 2003

a(29) and a(30) from Joseph Myers, Nov 21 2010

STATUS

approved

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Last modified August 20 08:50 EDT 2018. Contains 313914 sequences. (Running on oeis4.)