1 2 3 fd list                          NB.  First, second, and third forward differences (simultaneously)
43 _11 29  7 _10  _23  50 _50 _18
54 _40 22 17  13  _73 100 _32   0
94 _62  5  4  86 _173 132   0   0

   a: fd list                             NB.  All forward differences
  90    47   58   29  22   32  55   5  55 73
  43   _11   29    7 _10  _23  50 _50 _18  0
  54   _40   22   17  13  _73 100 _32   0  0
  94   _62    5    4  86 _173 132   0   0  0
 156   _67    1  _82 259 _305   0   0   0  0
 223   _68   83 _341 564    0   0   0   0  0
 291  _151  424 _905   0    0   0   0   0  0
 442  _575 1329    0   0    0   0   0   0  0
1017 _1904    0    0   0    0   0   0   0  0
2921     0    0    0   0    0   0   0   0  0
   0     0    0    0   0    0   0   0   0  0