# A153987 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 3
4 5
5 12
6 33
7 97
8 381
9 1490
10 7757
11 42774
12 307960
13 2294754
14 22718581
15 231171797
16 3121763126
17 43651298703
18 807916379400
19 15440457456928
20 391605380566734
21 10243338678890245
22 355535039683009851