# A004040 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 23
4 103
5 512
6 2740
7 15485
8 91245
9 555662
10 3475090
11 22214707
12 144640291
13 956560748
14 6411521056
15 43478151737
16 297864793993
17 2059159989914
18 14350039389022
19 100726680316559
20 711630547589023
21 5057282786190872
22 36132861123763276
23 259423620328055093
24 1870954187618001253