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1, 10, 68, 424, 2576, 15520, 93248, 559744, 3358976, 20154880, 120931328, 725592064, 4353560576, 26121379840, 156728311808, 940369936384, 5642219749376, 33853318758400, 203119913074688, 1218719479496704
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (1+2*x)/((1-6*x)(1-2*x)).
E.g.f. 2exp(6*x)-exp(2*x).
a(0)=1, a(2)=10; for n>2, a(n) = 8*a(n-1) -12*a(n-2). - Vincenzo Librandi, Aug 10 2013
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MATHEMATICA
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CoefficientList[Series[(1 + 2 x) / ((1 - 6 x) (1 - 2 x)), {x, 0, 40}], x] (* Vincenzo Librandi, Aug 10 2013 *)
Table[2*6^n-2^n, {n, 0, 20}] (* or *) LinearRecurrence[{8, -12}, {1, 10}, 20] (* Harvey P. Dale, Mar 17 2019 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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