# A121399 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 6
4 17
5 42
6 114
7 302
8 827
9 2263
10 6275
11 17468
12 48967
13 137834
14 389738
15 1105861
16 3148240
17 8987989
18 25726635
19 73808069
20 212196040
21 611219900
22 1763659860
23 5097131364
24 14752847173
25 42757853357
26 124080269331
27 360493591232