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A087449
n4^(n-1)+2*4^n/3+1/3.
+0
2
1, 4, 19, 91, 427, 1963, 8875, 39595, 174763, 764587, 3320491, 14330539, 61516459, 262843051, 1118481067, 4742359723, 20043180715, 84467690155, 355050629803, 1488921995947, 6230565890731, 26021775190699, 108485147273899
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Maintained by
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Last modified December 20 13:54 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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