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A072258
((6n+1)*4^n-1)/3.
+0
6
0, 9, 69, 405, 2133, 10581, 50517, 234837, 1070421, 4805973, 21321045, 93672789, 408245589, 1767200085, 7605671253, 32570168661, 138870609237, 589842175317, 2496807654741, 10536986432853
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Maintained by
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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