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A061278
a(n) = 5a(n-1)-5a(n-2)+a(n-3) with a(1) = 1 and a(k) = 0 if k< = 0.
+0
20
0, 1, 5, 20, 76, 285, 1065, 3976, 14840, 55385, 206701, 771420, 2878980, 10744501, 40099025, 149651600, 558507376, 2084377905, 7779004245, 29031639076, 108347552060, 404358569165, 1509086724601, 5631988329240, 21018866592360
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.
AT&T Labs Research
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