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A005320
a(n) = 4a(n-1) - a(n-2), with a(0) = 0, a(1) = 3.
(Formerly M2919)
+0
4
0, 3, 12, 45, 168, 627, 2340, 8733, 32592, 121635, 453948, 1694157, 6322680, 23596563, 88063572, 328657725, 1226567328, 4577611587, 17083879020, 63757904493, 237947738952, 888033051315, 3314184466308, 12368704813917
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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