1,4
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A047713.
Sequence in context: A033196 A060621 A058880 this_sequence A073403 A064518 A135178
Adjacent sequences: A055548 A055549 A055550 this_sequence A055552 A055553 A055554
nonn,more
Eric Weisstein (eric(AT)weisstein.com)
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