A190393
Number of ways to place n nonattacking nightriders on an n X n toroidal board.
Original entry on oeis.org
1, 2, 6, 24, 120, 144, 28, 1408, 2025, 86400, 1782, 1092096, 4186, 31360, 241920000, 23953408, 140692, 114108912, 1092690
Offset: 1
A190394
Maximum number of nonattacking nightriders on an n X n board.
Original entry on oeis.org
1, 4, 5, 8, 10, 16, 17, 20, 21, 24, 26, 32, 33, 36, 39, 42, 45, 48, 51, 54, 58, 64, 65, 66, 68, 72, 75, 80, 81, 84, 87, 90, 93
Offset: 1
From _Rob Pratt_, Jul 24 2015: (Start)
a(20) = 54:
XX--XXXX---X------XX
XX---------X--XX--XX
--------------------
---X----------------
X-----------------X-
X-----------------X-
X-------------------
X---------X---------
------------------XX
------------X-------
-------X------------
XX------------------
---------X---------X
-------------------X
-X-----------------X
-X-----------------X
----------------X---
--------------------
XX--XX--X---------XX
XX------X---XXXX--XX
(End)
A196811
Number of ways to place 3 nonattacking nightriders on an n X n cylindrical board.
Original entry on oeis.org
0, 0, 6, 144, 600, 1992, 4592, 15616, 31788, 74840, 122210, 251184, 384826, 647696, 1085190, 1616384, 2308872, 3449880, 4783326, 7052400, 9253734, 12454640, 16453096, 22180992, 28552450, 36216544, 46089162, 58449104, 72061346, 91140000, 109813780, 135448576
Offset: 1
A196813
Number of ways to place 3 nonattacking nightriders on an n X n toroidal board.
Original entry on oeis.org
0, 0, 6, 96, 600, 1392, 2156, 10624, 22410, 62400, 82280, 210336, 280540, 495488, 955950, 1332736, 1844976, 2924640, 3933456, 6319200, 7954170, 10648000, 14081980, 19826304, 25502500, 31809856, 41037354, 52338272, 63979916, 84001200, 98348740, 123033600
Offset: 1
A196814
Number of ways to place n nonattacking nightriders on an n X n cylindrical board.
Original entry on oeis.org
1, 4, 6, 84, 120, 784, 280, 40816, 13806, 1361706, 110990, 142633176, 4263454, 197730660, 9246172320
Offset: 1
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