|
Search: id:A125817
|
|
|
| A125817 |
|
a(n)=((1 + 3Sqrt[2])^n - (1 - 3Sqrt[2])^n)/(2Sqrt[2]). |
|
+0
2
|
|
| 0, 3, 6, 63, 228, 1527, 6930, 39819, 197448, 1071819, 5500254, 29221431, 151947180, 800658687, 4184419434, 21980036547, 115095203472
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
FORMULA
|
a(0)=0, a(1)=3, a(n)=2*a(n-1)+17*a(n-2) for n>=2 . G.f.:3*x/(1-2*x-17*x^2) - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 12 2006
|
|
MATHEMATICA
|
Expand[Table[((1 + 3Sqrt[2])^n - (1 - 3Sqrt[2])^n)/(2Sqrt[2]), {n, 0, 30}]] (*Artur Jasinski*)
|
|
CROSSREFS
|
Sequence in context: A137134 A137090 A137138 this_sequence A053948 A137091 A137135
Adjacent sequences: A125814 A125815 A125816 this_sequence A125818 A125819 A125820
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Artur Jasinski (grafix(AT)csl.pl), Dec 10 2006
|
|
|
Search completed in 0.002 seconds
|
