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A003462
(3^n - 1)/2.
(Formerly M3463)
+0
130
0, 1, 4, 13, 40, 121, 364, 1093, 3280, 9841, 29524, 88573, 265720, 797161, 2391484, 7174453, 21523360, 64570081, 193710244, 581130733, 1743392200, 5230176601, 15690529804, 47071589413, 141214768240, 423644304721, 1270932914164
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Maintained by
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
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