0,2
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A005840.
Sequence in context: A141147 A120928 A111537 this_sequence A112912 A124467 A075792
Adjacent sequences: A051042 A051043 A051044 this_sequence A051046 A051047 A051048
nonn,more
Eric Weisstein (eric(AT)weisstein.com)
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