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A014409 Number of inequivalent ways a pair of checkers can be placed on an n X n board. +0
5
0, 2, 8, 21, 49, 93, 171, 278, 446, 660, 970, 1347, 1863, 2471, 3269, 4188, 5356, 6678, 8316, 10145, 12365, 14817, 17743, 20946, 24714, 28808, 33566, 38703, 44611, 50955, 58185, 65912, 74648, 83946, 94384, 105453, 117801, 130853 (list; graph; listen)
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.


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