# A131351 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 4
4 9
5 24
6 77
7 295
8 1329
9 6924
10 41030
11 272271
12 1996406
13 16000511
14 138953665
15 1298206570
16 12969761907
17 137846434950
18 1551712558368
19 18429620298121
20 230175973108212
21 3014142623764514
22 41275488455847862
23 589698136493691293