A196814 Number of ways to place n nonattacking nightriders on an n X n cylindrical board

1, 4, 6, 84, 120, 784, 280, 40816, 13806, 1361706, 110990, 142633176, 4263454, 197730660, 9246172320

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