User blog comment:Leighton90chamberlain/108xen/@comment-27516045-20160911105303/@comment-29014792-20160911114746

Let me think about 108xen compared with AAN.

So 108xen is approx to {10,(10^54)^^^(10^54)^^3,1,2}, thanks to Username5243.

10^54 is approx a(10,54,1), a(10,54,1)^^^a(10,54,1) is approx to a(10,a(10,54,1),3), and ^^3 was ignored.

{X,Y,1,2} have the level w+1, or well as a(X,Y,1,1) so 108xen ~ a(10,a(10,a(10,54,1),3),1,1).