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A015532
a(n) = 4 a(n-1) + 7 a(n-2).
+0
1
0, 1, 4, 23, 120, 641, 3404, 18103, 96240, 511681, 2720404, 14463383, 76896360, 408829121, 2173591004, 11556167863, 61439808480, 326652408961, 1736688295204, 9233320043543, 49090098240600, 260993633267201
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Maintained by
N. J. A. Sloane
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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