1,9
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A035348.
Sequence in context: A077455 A068754 A035873 this_sequence A154673 A130179 A125253
Adjacent sequences: A046165 A046166 A046167 this_sequence A046169 A046170 A046171
nonn
Eric Weisstein (eric(AT)weisstein.com)
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