1,2
M. Gardner, Mathematical Games, Sci. Amer. Vol. 216 (No. 4, Apr. 1967), p. 118.
M. Gardner, Mathematical Magic Show. Random House, NY, 1978, p. 216.
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Adjacent sequences: A003457 A003458 A003459 this_sequence A003461 A003462 A003463
Sequence in context: A003766 A046182 A092122 this_sequence A157626 A128120 A030449
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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