User blog comment:B1mb0w/J Function Sandpit J 3/@comment-26428969-20151013201109/@comment-10262436-20151014004553

Hi. Code is available in Microsoft Excel VBA code. I will put it up later today. Cheers.

P.S. The code is not complete and contains errors when calculating w^^3 ordinals. Plan to correct these so that it reliably works up to w^^7 and epsilon_0(7). I also plan to write pseudo code to explain how the code works. That will take more time.

P.P.S.S. When J_3 finally works, it will reliably sequence all FGH functions in ascending size for almost every ordinal between w and epsilon_0. Therefore it is dominated by e0+1 as you correctly call out. I have started documenting J_4 function which will provide an ascending sequence for ordinals beyond epsilon_0 and through the Veblen hierarchy. This is a work in progress, but appreciate your comments along the way.