A067691 a(n) = (a(n-1) + 1)^(n-1) for n > 0, a(0) = 0.

0, 1, 2, 9, 1000, 1004006004001, 1020191144865623440455270145683555422808365843606721760320032

Offset: 0

Author

Reinhard Zumkeller, Feb 04 2002

Keywords

• nonn

Comments

a(7) has 361 digits.

Examples

			Given a(3) = 9: a(4) = (a(4-1)+1)^(4-1) = (9+1)^3 = 1000.
		

Crossrefs

Cf. A004019.

Programs

PARI

a(n) = if (n==0, 0, (a(n-1) + 1)^(n-1)); \\ Michel Marcus, Feb 05 2021