1,1
P. Winkler, Mathematical Mind-Benders, Peters, Wellesley, MA, 2007; see p. 26.
See A133483 for the other group.
Sequence in context: A051214 A192391 A013634 * A181155 A153081 A190841
Adjacent sequences: A133481 A133482 A133483 * A133485 A133486 A133487
nonn,fini,full
N. J. A. Sloane (njas(AT)research.att.com), Nov 29 2007