|
|
A109173
|
|
Recursive form of A109845 but with a(1)=1.
|
|
0
|
|
|
1, 3, 5, 31, 929, 863971, 746445024869, 557180175152428473492031, 310449747582890872093779269721785644810947012929, 96379045774280656880008037888192772255684941220159788508646084243678677683026025975278640171971
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
The next term -- a(11) -- has 190 digits. - Harvey P. Dale, Aug 29 2012
|
|
LINKS
|
|
|
FORMULA
|
a(1) = 1, a(n)=a(n-1)^2+(-1)^n*a(n-1)+(-1)^n
|
|
MAPLE
|
a := proc(n) option remember; if n=1 then 1 else a(n-1)^2+(-1)^n*a(n-1)+(-1)^n fi end:
|
|
MATHEMATICA
|
RecurrenceTable[{a[1]==1, a[n]==a[n-1]^2+(-1)^n a[n-1]+(-1)^n}, a, {n, 10}] (* Harvey P. Dale, Aug 29 2012 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|