A262570 a(n) = A002704(n)/2.

1, 13, 469, 21400, 1065229, 55778797, 3020636341, 167544629317, 9461343754981, 541786421337805, 31372013730812824, 1833216802356228733, 107939805322734748117, 6396432908013911687437, 381139174656828902370421, 22819171231066917509661277

Offset

0,2

Links

Table of n, a(n) for n=0..15.

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, A262583, A262584.

Sequence in context: A197749 A198154 A197234 * A012073 A012143 A368788

Adjacent sequences: A262567 A262568 A262569 * A262571 A262572 A262573

Keyword

nonn

Author

N. J. A. Sloane, Oct 20 2015

Extensions

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

Status

approved