A238844 Combinatorial configuration types of n (unlabeled) queens on a square board.

1, 4, 36, 574, 14206, 501552

Offset

1,2

Comments

I believe an early version of Chaiken et al., Part I, had a(6) = 510552, but Parts I and IV now both have a(6) = 501552. - N. J. A. Sloane, Aug 22 2017

Links

Table of n, a(n) for n=1..6.

Seth Chaiken, Christopher R. H. Hanusa, and Thomas Zaslavsky, A q-queens problem. I. General theory, Electronic J. Combin., 21 (2014), no. 3, Paper #P3.33, 28 pp. MR 3262270, Zbl 1298.05021. Also arxiv preprint, arXiv:1303.1879 [math.CO], 2013-2014.

Christopher R. H. Hanusa, T Zaslavsky, S Chaiken, A q-Queens Problem. IV. Queens, Bishops, Nightriders (and Rooks), arXiv preprint arXiv:1609.00853 [math.CO], 2016. See Table 8.1.

Crossrefs

Cf. A176186, A178721.

Sequence in context: A070780 A132687 A364152 * A073852 A139033 A370753

Adjacent sequences: A238841 A238842 A238843 * A238845 A238846 A238847

Keyword

nonn

Author

N. J. A. Sloane, Mar 20 2014

Extensions

a(6) corrected by N. J. A. Sloane, Aug 22 2017

Status

approved