1,2
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A048917, A048918.
Sequence in context: A052498 A055321 A092300 this_sequence A055310 A048832 A115673
Adjacent sequences: A048913 A048914 A048915 this_sequence A048917 A048918 A048919
nonn
Eric Weisstein (eric(AT)weisstein.com)
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