OFFSET
1,1
COMMENTS
Includes a^(a*b)+a = (a^b)^a+a for a,b > 1. - Robert Israel, Apr 28 2019
EXAMPLE
a(1) = 6 = 2^2 + 2, in this case a = b = x = y = 2.
a(2) = 18 = 2^4 + 2 = 4^2 + 2.
a(8) = 732 = 3^6 + 3 = 9^3 + 3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, Jan 18 2015
STATUS
approved