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T. Fine and J. Gill, Comparative probability relations, Ann. Prob. 4 (1976) 667-673.
D. Maclagan, Boolean Term Orders and the Root System B_n, Order 15 (1999), 279-295.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=1..7.
D. Maclagan, [math/9809134] Boolean Term Orders and the Root System B_n
For n=3, the two orders are 1 < 2 < 12 < 3 < 13 < 23 < 123 and 1 < 2 < 3 < 12 < 13 < 23 < 123.
Sequence in context: A277134 A009997 A048137 * A015184 A012002 A012005
Adjacent sequences: A005803 A005804 A005805 * A005807 A005808 A005809
N. J. A. Sloane
a(7) from Diane Maclagan and Michael Kleber