1,3
D. E. Knuth, TAOCP, Section 7.2.1.2, Problems 107-109.
Sequence in context: A086873 A101560 A010243 this_sequence A102849 A088333 A016538
Adjacent sequences: A123395 A123396 A123397 this_sequence A123399 A123400 A123401
nonn
N. J. A. Sloane (njas(AT)research.att.com), Oct 15 2006
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