a(n) = 8a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 8, a(n) = (4+sqrt(15))^n + (4-sqrt(15))^n.
2, 8, 62, 488, 3842, 30248, 238142, 1874888, 14760962, 116212808, 914941502
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Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences