# A048121 (b-file synthesized from sequence entry)
1 0
2 0
3 1
4 3
5 12
6 42
7 156
8 570
9 2124
10 7926
11 29844
12 112812
13 428712
14 1635108
15 6259236
16 24031260
17 92517180
18 357019224
19 1380671532
20 5349496152
21 20762603724
22 80709201504
23 314178212928
24 1224576411084
25 4778651920092
26 18667769062044