A153060 a(0)=4, a(n)=a(n-1)^2 - n for n > 0.

4, 15, 223, 49726, 2472675072, 6114122011690205179, 37382487973834681475536573127118422035, 1397450407113894589170760370457882734663916414838438245542265330668373541218

Offset: 0

Author

Vladimir Joseph Stephan Orlovsky, Dec 17 2008

Keywords

• nonn

Links

• Index entries for sequences of form a(n+1)=a(n)^2 + ...

Crossrefs

Cf. A153059.

Programs

Mathematica

RecurrenceTable[{a[0]==4, a[n]==a[n-1]^2-n}, a, {n, 0, 10}] (* Vaclav Kotesovec, Dec 18 2014 *)

Formula

a(n) ~ c^(2^n), where c = 3.8643187364012066048723545708047003493006832597186603613771125549936188672... . - Vaclav Kotesovec, Dec 18 2014

Extensions

Definition amended by Georg Fischer, Jul 15 2022