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A225740 Number of arrangements of n nonattacking Queens on an n X n board, with no Queens on both main diagonals. 2
0, 0, 0, 2, 0, 4, 0, 12, 10, 20, 88, 810, 2502, 13426, 91120, 521240, 3454652, 22085852, 182785512 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..19.

V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p.447

Vaclav Kotesovec, example, board 8x8, no queens on line a1-h8 and no queens on line a8-h1

CROSSREFS

Cf. A000170, A003471.

Sequence in context: A285773 A137449 A056946 * A111757 A286122 A286776

Adjacent sequences:  A225737 A225738 A225739 * A225741 A225742 A225743

KEYWORD

nonn,more,hard

AUTHOR

Vaclav Kotesovec, Aug 04 2013

STATUS

approved

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Last modified October 23 17:37 EDT 2021. Contains 348215 sequences. (Running on oeis4.)