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1, 16, 181, 1996, 21961, 241576, 2657341, 29230756, 321538321, 3536921536, 38906136901, 427967505916, 4707642565081, 51784068215896, 569624750374861, 6265872254123476, 68924594795358241, 758170542748940656, 8339875970238347221
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 11*a(n-1)+5.
a(n) = 12*a(n-1)-11*a(n-2), n>1.
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MATHEMATICA
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(3*11^Range[0, 20]-1)/2 (* or *) LinearRecurrence[{12, -11}, {1, 16}, 20] (* Harvey P. Dale, Jul 16 2012 *)
CoefficientList[Series[(1 + 4*x)/(1 - 12*x + 11*x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 04 2013 *)
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PROG
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(Magma) [(3*11^n-1)/2 : n in [0..20]]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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