A120697 Set partitions interpreted as base m+1 numbers, where m is the size of the set.
0, 1, 4, 5, 21, 22, 25, 26, 27, 156, 157, 161, 162, 163, 181, 182, 183, 186, 187, 188, 191, 192, 193, 194, 781, 782, 786, 787, 788, 806, 807, 808, 811, 812, 813, 816, 817, 818, 819, 906, 907, 908, 911, 912, 913, 916, 917, 918, 919, 931, 932, 933, 936, 937, 938
Offset: 0
Examples
Set partition number 3 is {1,2}, 12 in base 3 is 5, so a(3) = 5.