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A055267
a(n)=3a(n-1)-a(n-2); a(0)=1, a(1)=7.
+0
3
1, 7, 20, 53, 139, 364, 953, 2495, 6532, 17101, 44771, 117212, 306865, 803383, 2103284, 5506469, 14416123, 37741900, 98809577, 258686831, 677250916, 1773065917, 4641946835, 12152774588, 31816376929, 83296356199
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Maintained by
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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