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A004208
a(n) = n(2n-1)!!- Sum a(k)(2n-2k-1)!!.
(Formerly M3985)
+0
4
1, 5, 37, 353, 4081, 55205, 854197, 14876033, 288018721, 6138913925, 142882295557, 3606682364513, 98158402127761, 2865624738913445, 89338394736560917, 2962542872271918593, 104128401379446177601
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.
AT&T Labs Research
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