A393297 a(n) = Pell(Pell(n)) where Pell(n) = A000129(n).

0, 1, 2, 29, 13860, 44560482149, 220167382952941249990598278, 17280083176824678419775054525017769508908307965108250063833395641

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..10

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.

Cf. A000129, A005371, A007570, A061306, A273399.

Sequence in context: A345041 A114533 A180128 * A367871 A087194 A331427

Adjacent sequences: A393294 A393295 A393296 * A393298 A393299 A393300

Keyword

nonn

Author

Aminos Abijad, Feb 10 2026

Status

approved