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A127261
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a(0)=2, a(1)=2, a(n)=2*a(n-1)+10*a(n-2).
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1
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2, 2, 24, 68, 376, 1432, 6624, 27568, 121376, 518432, 2250624, 9685568, 41877376, 180610432, 779994624, 3366093568, 14532133376, 62725202432, 270771738624, 1168795501568, 5045308389376
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| a(n)=[1+sqrt(11)]^n+[1-sqrt(11)]^n, with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Jul 31 2008]
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MAPLE
| a[0]:=2:a[1]:=2:for i from 2 to 40 do a[i]:=2*a[i-1]+10*a[i-2] od: seq(a[n], n=0..40);
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PROG
| (Other) sage: [lucas_number2(n, 2, -10) for n in xrange(0, 21)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 30 2009]
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CROSSREFS
| Sequence in context: A120065 A131448 A156447 * A194130 A032336 A032084
Adjacent sequences: A127258 A127259 A127260 * A127262 A127263 A127264
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KEYWORD
| easy,nonn
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AUTHOR
| Miklos Kristof (kristmikl(AT)freemail.hu), Mar 27 2007
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