VOOZH about

URL: https://oeis.org/A393297

⇱ A393297 - OEIS

login
A393297
a(n) = Pell(Pell(n)) where Pell(n) = A000129(n).
2
0, 1, 2, 29, 13860, 44560482149, 220167382952941249990598278, 17280083176824678419775054525017769508908307965108250063833395641
OFFSET
0,3
LINKS
FORMULA
a(n) = A000129(A000129(n)).
MAPLE
a:= (n-> (<<2|1>, <1|0>>^n)[1, 2])@@2:
seq(a(n), n=0..8); # Alois P. Heinz, Feb 10 2026
MATHEMATICA
Nest[Fibonacci[#, 2] &, Range[0, 8], 2] (* Paolo Xausa, Feb 18 2026 *)
CROSSREFS
Partial sums of A111415.
Sequence in context: A345041 A114533 A180128 * A367871 A087194 A331427
KEYWORD
nonn
AUTHOR
Aminos Abijad, Feb 10 2026
STATUS
approved