1,2
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A048916, A048918.
Sequence in context: A124990 A013752 A076811 this_sequence A081317 A027680 A022547
Adjacent sequences: A048914 A048915 A048916 this_sequence A048918 A048919 A048920
nonn
Eric Weisstein (eric(AT)weisstein.com)
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