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A003149
Sum_{k=0..n} k!(n-k)!.
(Formerly M1496)
+0
14
1, 2, 5, 16, 64, 312, 1812, 12288, 95616, 840960, 8254080, 89441280, 1060369920, 13649610240, 189550368000, 2824077312000, 44927447040000, 760034451456000, 13622700994560000, 257872110354432000, 5140559166898176000
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Maintained by
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.
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