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Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard.

4

`%I #7 Oct 21 2014 03:41:24
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`%S 1,2,15,207,6084,292607,23511001,3132847224,693856861039,
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`%T 259806377729539
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`%N Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard.
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`%Y Cf. A143870, A143875, A143886.
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`%Y Cf. A143882, A143883, A143884, A143885.
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`%K nonn,more,hard
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`%O 0,2
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`%A _R. H. Hardin_, Sep 04 2008
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