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A196814 Number of ways to place n nonattacking nightriders on an n X n cylindrical board 1
1, 4, 6, 84, 120, 784, 280, 40816, 13806, 1361706, 110990, 142633176, 4263454, 197730660, 9246172320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

V. Kotesovec, Non-attacking chess pieces

CROSSREFS

Cf. A190393, A196810, A196811, A172141, A173429

Sequence in context: A264374 A013127 A012970 * A213335 A101138 A222483

Adjacent sequences:  A196811 A196812 A196813 * A196815 A196816 A196817

KEYWORD

nonn,hard

AUTHOR

Vaclav Kotesovec, Oct 06 2011

STATUS

approved

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Last modified August 20 07:48 EDT 2019. Contains 326143 sequences. (Running on oeis4.)