# A149373 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 46
5 174
6 703
7 2888
8 12148
9 51924
10 224551
11 982451
12 4331352
13 19247666
14 86027816
15 386632310
16 1745493623
17 7912474214
18 35995573003
19 164273095721
20 751821506551
21 3449621370468
22 15864629611684
23 73113526659709
24 337594692984764
25 1561539606796564
26 7234504448723448
27 33566690644670128