a(n)=18a(n-1)-80a(n-2), a(0)=1, a(1)=9. G.f.: (1-9x)/((1-8x)(1-10x)). E.g.f. exp(9x)cosh(x). a(n)=8^n/2+10^n/2.
1, 9, 82, 756, 7048, 66384, 631072, 6048576, 58388608, 567108864, 5536870912
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Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences