A241098 (4^n - 1)^n.

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

Offset: 0

Author

Hannah Ko, Apr 15 2014

Keywords

• nonn

Examples

			a(3) = 63^3 = 250047.
		

Crossrefs

Cf. A055601, A060613, A241095, A240091.

Programs

PARI

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

Formula

(4^n - 1)^n