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Table of n, a(n) for n=0..40.
Cf. A002385, A046316, A046373.
Sequence in context: A119434 A091495 A256673 * A128278 A234103 A128284
Adjacent sequences: A046402 A046403 A046404 * A046406 A046407 A046408
Patrick De Geest, Jun 15 1998.
Definition clarified by N. J. A. Sloane, Dec 19 2017 at the suggestion of Harvey P. Dale.