1,2
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A048920, A048921.
Sequence in context: A137057 A004391 A052069 this_sequence A159718 A157460 A093244
Adjacent sequences: A048916 A048917 A048918 this_sequence A048920 A048921 A048922
nonn
Eric Weisstein (eric(AT)weisstein.com)
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