1-2 of about 2 matches for site:oeis.org greenhill
https://oeis.org/A007022
n, a(n) for n=1..34. Gunnar Brinkmann, Sam Greenberg, Catherine Greenhill, Brendan D. McKay, Robin
https://oeis.org/A002880
count of order 20 (22131). Photo by Stuart E Anderson. G. Brinkmann, S. Greenberg, C. Greenhill, B. D. McKay, R