# A181879 (b-file synthesized from sequence entry)
0 0
1 1
2 4
3 16
4 65
5 263
6 1065
7 4312
8 17459
9 70690
10 286218
11 1158873
12 4692181
13 18998253
14 76922356
15 311452261
16 1261044460
17 5105864780
18 20673224441
19 83704176903
20 338911293253
21 1372223811812
22 5556020785351
23 22495868896554
24 91083913642878
25 368791237300201
26 1493205235368669
27 6045864568949689
28 24479205885623944
29 99114281168039257
30 401305531615563236