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A091344
a(n) = 2*3^n-3*2^n+1.
+0
3
0, 1, 7, 31, 115, 391, 1267, 3991, 12355, 37831, 115027, 348151, 1050595, 3164071, 9516787, 28599511, 85896835, 257887111, 774054547, 2322950071, 6970423075, 20914414951, 62749536307, 188261191831, 564808741315, 1694476555591
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Maintained by
N. J. A. Sloane
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
AT&T Labs Research
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