1,2
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A048901, A048903.
Sequence in context: A157490 A020247 A011816 this_sequence A083958 A083959 A078212
Adjacent sequences: A048899 A048900 A048901 this_sequence A048903 A048904 A048905
nonn
Eric Weisstein (eric(AT)weisstein.com)
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