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A106174
a(n) = 2*n*a(n-1)-a(n-2).
+0
4
0, 1, 4, 23, 180, 1777, 21144, 294239, 4686680, 84066001, 1676633340, 36801867479, 881568186156, 22883970972577, 639869619046000, 19173204600407423, 612902677593991536, 20819517833595304801, 748889739331836981300
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.
AT&T Labs Research
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