// output of ./demo/comb/bell-number-demo.cc:
// Description:
//% Bell numbers.

arg 1: 11 == N  [Show N rows]  default=11
 0:    1
 1:    1   2
 2:    2   3   5
 3:    5   7  10  15
 4:   15  20  27  37  52
 5:   52  67  87 114 151 203
 6:  203 255 322 409 523 674 877
 7:  877 1080 1335 1657 2066 2589 3263 4140
 8:  4140 5017 6097 7432 9089 11155 13744 17007 21147
 9:  21147 25287 30304 36401 43833 52922 64077 77821 94828 115975
10:  115975 137122 162409 192713 229114 272947 325869 389946 467767 562595 678570
