# A045740 (b-file synthesized from sequence entry)
1 1
2 3
3 12
4 62
5 370
6 2397
7 16345
8 115376
9 834786
10 6152285
11 45990120
12 347673108
13 2652283517
14 20385035972
15 157656007680
16 1225743120520
17 9572972899946
18 75056029550721
19 590469939950716
20 4659115833115680
21 36859770507695688