A262584 a(n) = (A002704(n) - 2)/2.

0, 12, 468, 21399, 1065228, 55778796, 3020636340, 167544629316, 9461343754980, 541786421337804, 31372013730812823, 1833216802356228732, 107939805322734748116, 6396432908013911687436, 381139174656828902370420

Offset: 0

Author

N. J. A. Sloane, Oct 20 2015

Keywords

• nonn

Links

• Alexander Rosa and Štefan Znám, A combinatorial problem in the theory of congruences (Russian with English summary), Mat.-Fys. Casopis Sloven. Akad. Vied 15 1965 49-59. [Annotated scanned copy.]
• Alexander Rosa and Štefan Znám, A remark on a combinatorial problem (Russian with English summary), Mat.-Fyz. Casopis Sloven. Akad. Vied 15 1965 313-316. [Annotated scanned copy] See Table 3.

Crossrefs

Cf. A002704, A262570, A262583.

Extensions

More terms from R. J. Mathar, Oct 21 2015