1,1
P. Winkler, Mathematical Mind-Benders, Peters, Wellesley, MA, 2007; see p. 26.
See A133483 for the other group.
Sequence in context: A047254 A051214 A013634 this_sequence A153081 A095952 A025033
Adjacent sequences: A133481 A133482 A133483 this_sequence A133485 A133486 A133487
nonn,fini,full
N. J. A. Sloane (njas(AT)research.att.com), Nov 29 2007
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