1,1
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A047715.
Sequence in context: A116980 A022135 A028564 this_sequence A047715 A031291 A134538
Adjacent sequences: A003335 A003336 A003337 this_sequence A003339 A003340 A003341
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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