A241098 a(n) = (4^n - 1)^n.

1, 3, 225, 250047, 4228250625, 1120413075641343, 4715453174592516890625, 316777275155162685106909462527, 340240830764391036687105719527812890625, 5845805845679338940092384222659294205213252255743, 1606922719369349023077959288770050490334792256259918212890625

Offset

0,2

Links

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

Formula

(4^n - 1)^n

Example

a(3) = 63^3 = 250047.

Prog

(PARI) a(n) = (4^n - 1)^n; \\ Michel Marcus, Apr 16 2014

Crossrefs

Cf. A055601, A060613, A241095, A240091.

Sequence in context: A157557 A279532 A157582 * A254157 A131493 A228871

Adjacent sequences: A241095 A241096 A241097 * A241099 A241100 A241101

Keyword

nonn

Author

Hannah Ko, Apr 15 2014

Status

approved