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Table of n, a(n) for n=1..51.
Cf. A032378, A066353, A120721.
Sequence in context: A000096 A134189 A109470 * A048093 A024669 A006482
Adjacent sequences: A112870 A112871 A112872 * A112874 A112875 A112876
N. J. A. Sloane, Oct 29 2006