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A084329
a(0)=0, a(1)=1, a(n)=20a(n-1)-20a(n-2).
+0
2
0, 1, 20, 380, 7200, 136400, 2584000, 48952000, 927360000, 17568160000, 332816000000, 6304956800000, 119442816000000, 2262757184000000, 42866287360000000, 812070603520000000, 15384086323200000000
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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 3 22:15 EST 2009. Contains 170310 sequences.
AT&T Labs Research
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