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Table of n, a(n) for n=1..18.
Cf. A036229, A020471, A036324.
Sequence in context: A003545 A104094 A220382 * A127890 A198973 A127859
Adjacent sequences: A036947 A036948 A036949 * A036951 A036952 A036953
Patrick De Geest, Jan 04 1999.