overview of finiteness proof Gerog comment "not helpful", adding more intuitions of "closed forms"
%% data points for derivative size explosion with bsimp
0 6
1 23
2 195
3 2691
4 17897
5 538719
6 1080927
7 8727607
8 39089493
%%21141189
%%9 26506133
%%10 32488813
%%11 39089493