1,5
Source
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A019317.
Adjacent sequences: A001363 A001364 A001365 this_sequence A001367 A001368 A001369
Sequence in context: A038944 A124081 A119573 this_sequence A093329 A111052 A138536
nonn
Mario Velucchi (mathchess(AT)velucchi.it)
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