a(n) = 7a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 7, a(n) = [(7+sqrt(53))/2]^n + [(7-sqrt(53))/2]^n.
2, 7, 51, 364, 2599, 18557, 132498, 946043, 6754799, 48229636, 344362251
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Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences