# A148987 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 33
5 107
6 441
7 1675
8 6829
9 26947
10 115669
11 474921
12 2054775
13 8602293
14 37922487
15 162930585
16 720453423
17 3124409345
18 14010065523
19 61601080593
20 276959416907
21 1226301729261
22 5558631767127
23 24856711661343
24 112885565645001
25 507054682613963
26 2317442672800633
27 10478569080891183
28 47969825346568941