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A030195
a(n) = 3*a(n-1)+3*a(n-2), a(0)=0, a(1)=1.
+0
15
0, 1, 3, 12, 45, 171, 648, 2457, 9315, 35316, 133893, 507627, 1924560, 7296561, 27663363, 104879772, 397629405, 1507527531, 5715470808, 21668995017, 82153397475, 311467177476, 1180861724853, 4476986706987, 16973545295520
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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