A175981 a(1) = 1, for n >= 2: a(n) = a(n-1)^(n-1) - 1.

1, 0, -1, -2, 15, 759374, 191749544167774320464809980317709375

Offset

1,4

Comments

a(8) has 247 digits.

a(9) has 1976 digits. - Harvey P. Dale, Feb 11 2024

Links

Table of n, a(n) for n=1..7.

Example

For n = 5: a(5) = (-2)^(5-1) - 1 = 15.

Mathematica

nxt[{n_, a_}]:={n+1, a^n-1}; NestList[nxt, {1, 1}, 7][[;; , 2]] (* Harvey P. Dale, Feb 11 2024 *)

Crossrefs

Sequence in context: A135085 A290042 A080911 * A056072 A294195 A175982

Adjacent sequences: A175978 A175979 A175980 * A175982 A175983 A175984

Keyword

sign

Author

Jaroslav Krizek, Nov 03 2010

Status

approved