OFFSET
1,3
REFERENCES
J. Meeus, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
John Mason, Table of n, a(n) for n = 1..36
J. Meeus & N. J. A. Sloane, Correspondence, 1974-1975
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polyhex
CROSSREFS
KEYWORD
nonn,hard,nice
AUTHOR
EXTENSIONS
a(7)-a(12) from David W. Wilson
a(13) from Achim Flammenkamp, Feb 15 1999
a(14)-a(20) from Joseph Myers, Sep 21 2002
a(21)-a(30) from John Mason, Jul 18 2023
STATUS
approved