OFFSET
1,3
COMMENTS
a(6) has 120 digits (1006016...1000000).
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..7
EXAMPLE
a(4) = (a(1) + a(2) + a(3))^4 = (1 + 1 + 8)^4 = 10^4 = 10000.
MATHEMATICA
a[1]:= 1; a[n_]:= (Sum[a[j], {j, 1, n-1}])^n; Table[a[n], {n, 1, 7}] (* G. C. Greubel, Oct 19 2018 *)
PROG
(PARI) {a(n) = if(n==1, 1, (sum(j=1, n-1, a(j)))^n)};
for(n=1, 7, print1(a(n), ", ")) \\ G. C. Greubel, Oct 19 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Sep 17 2009
EXTENSIONS
Edited by N. J. A. Sloane, Oct 15 2009
STATUS
approved