# A002902 (b-file synthesized from sequence entry)
1 3
2 15
3 75
4 363
5 1767
6 8463
7 40695
8 193983
9 926943
10 4404939
11 20967075
12 99421371
13 471987255
14 2234455839
15 10587573027
16 50060937987
17 236865126051
18 1118861842047
19 5288016609807
20 24958663919367
21 117855045251079
22 555890991721203
23 2622994107595707