|
Search: id:A127261
|
|
|
| A127261 |
|
a(0)=2, a(1)=2, a(n)=2*a(n-1)+10*a(n-2). |
|
+0
2
|
|
| 2, 2, 24, 68, 376, 1432, 6624, 27568, 121376, 518432, 2250624, 9685568, 41877376, 180610432, 779994624, 3366093568, 14532133376, 62725202432, 270771738624, 1168795501568, 5045308389376
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
FORMULA
|
a(n)=[1+sqrt(11)]^n+[1-sqrt(11)]^n, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Jul 31 2008]
|
|
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);
|
|
PROGRAM
|
(Other) sage: [lucas_number2(n, 2, -10) for n in xrange(0, 21)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 30 2009]
|
|
CROSSREFS
|
Sequence in context: A120065 A131448 A156447 this_sequence A032336 A032084 A120979
Adjacent sequences: A127258 A127259 A127260 this_sequence A127262 A127263 A127264
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Miklos Kristof (kristmikl(AT)freemail.hu), Mar 27 2007
|
|
|
Search completed in 0.002 seconds
|
