# A044049 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 7
4 31
5 139
6 609
7 2677
8 11827
9 52648
10 236071
11 1065774
12 4841428
13 22115678
14 101531221
15 468224323
16 2168076055
17 10076177264
18 46986612235
19 219777649588
20 1030892581741
21 4848039893338
22 22853638285655
23 107970202258065