# A026970 (b-file synthesized from sequence entry)
0 1
1 3
2 8
3 25
4 60
5 147
6 336
7 765
8 1700
9 3751
10 8184
11 17745
12 38220
13 81915
14 174752
15 371365
16 786420
17 1660239
18 3495240
19 7340025
20 15379100
21 32156323
22 67108848
23 139810125
24 290805060
25 603979767
26 1252698776
27 2594876065
28 5368709100