|
|
A254429
|
|
a(0) = 0; for n >= 0, a(n+1) = 2^a(n) + 1.
|
|
2
|
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
|
|
MATHEMATICA
|
RecurrenceTable[{a[0]==0, a[n]==2^a[n-1] + 1}, a, {n, 5}] (* Vincenzo Librandi, Feb 01 2015 *)
|
|
PROG
|
(Haskell)
a254429 n = a254429_list !! n
a254429_list = iterate ((+ 1) . (2 ^)) 0
(Magma) [n le 2 select 2*(n-1) else 2^Self(n-1)+1: n in [1..5]]; // Vincenzo Librandi, Feb 01 2015
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|