# A128568 (b-file synthesized from sequence entry)
0 1
1 6
2 31
3 133
4 587
5 2531
6 10950
7 47185
8 203704
9 879711
10 3804530
11 16464710
12 71312805
13 309083291
14 1340546867
15 5817555402
16 25258769216
17 109711224970
18 476675868834
19 2071569641859
20 9004430215111
21 39144480326143
22 170184867215647
23 739924236443359
24 3217001700174226