I'm trying to calculate the number of elements of length n in Higman's group (See *https://en <https://en>.wikipedia.org/wiki/Higman_group for example.)* The numbers that I get so far are 1 , 8 , 56 , 352, which wasn't in the OEIS when I looked. Anyone interested? <https://www.google.com/?gws_rd=ssl#>