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A154023
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a(n+2) = 36*a(n+1) - a(n), a(1)=0, a(2)=6.
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1
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0, 6, 216, 7770, 279504, 10054374, 361677960, 13010352186, 468011000736, 16835385674310, 605605873274424, 21784976052204954, 783653532006103920, 28189742176167536166, 1014047064810025198056, 36477504590984739593850
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OFFSET
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1,2
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COMMENTS
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If a(n)=x and a(n+1)=y then (x^2+y^2)/(xy+1)=36.
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LINKS
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FORMULA
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a(n)= +36*a(n-1) -a(n-2)
G.f.: 6*x/(1 -36*x +x^2). (End)
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MATHEMATICA
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PROG
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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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EXTENSIONS
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STATUS
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approved
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