# A354588 (b-file synthesized from sequence entry)
0 1
1 4
2 27
3 226
4 2116
5 21218
6 222851
7 2420134
8 26954622
9 306203536
10 3534170486
11 41326973520
12 488562349730
13 5829471835390
14 70112478797987
15 849110215237094
16 10345827793291654
17 126734013316914248
18 1559884942820510474
19 19281814963272771308
20 239263099541276559360
21 2979328903819471935332