OFFSET
1,1
COMMENTS
See O'Reilly reference for precise definition.
REFERENCES
Thomas J. O'Reilly, Classifying and Counting Hexaflexagrams, J. Rec. Math., 8 (1976), 182-187.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Sean A. Irvine, Java program (github)
Thomas J. O'Reilly, Classifying and Counting Hexaflexagrams, J. Rec. Math., 8 (1976), 182-187. [Annotated scanned copy]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Robert G. Wilson v, circa 1976.
EXTENSIONS
Title clarified and a(11)-a(19) from Sean A. Irvine, Jul 12 2022
STATUS
approved