0,4
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A001620, A002852, A046115.
Sequence in context: A002530 A042709 A042327 this_sequence A116654 A041020 A041527
Adjacent sequences: A046111 A046112 A046113 this_sequence A046115 A046116 A046117
nonn
Eric Weisstein (eric(AT)weisstein.com)
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