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A054491
a(n)=4a(n-1)-a(n-2), a(0)=1, a(1)=6.
+0
11
1, 6, 23, 86, 321, 1198, 4471, 16686, 62273, 232406, 867351, 3236998, 12080641, 45085566, 168261623, 627960926, 2343582081, 8746367398, 32641887511, 121821182646, 454642843073, 1696750189646, 6332357915511, 23632681472398
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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