1,2
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A048902, A048903.
Sequence in context: A051153 A129133 A001243 this_sequence A065146 A064977 A068400
Adjacent sequences: A048898 A048899 A048900 this_sequence A048902 A048903 A048904
nonn
Eric Weisstein (eric(AT)weisstein.com)
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