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A072257
((6n-17)*4^n-1)/3.
+0
6
-6, -15, -27, 21, 597, 4437, 25941, 136533, 677205, 3233109, 15029589, 68506965, 307582293, 1364546901, 5995058517, 26127717717, 113100805461, 486762960213, 2084490794325, 8887718991189
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Maintained by
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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