A175987 a(1) = 1, for n >= 2: a(n) = (a(n-1)-1)^n - 1.

1, -1, -9, 9999, 99900039992000799967

Offset

1,3

Comments

a(6) has 120 digits.

Links

Table of n, a(n) for n=1..5.

Example

For n = 4: a(4) = (-9-1)^4 - 1 = 9999.

Crossrefs

Sequence in context: A240091 A263438 A137063 * A321618 A055320 A271717

Adjacent sequences: A175984 A175985 A175986 * A175988 A175989 A175990

Keyword

sign

Author

Jaroslav Krizek, Nov 03 2010

Status

approved