# A237501 (b-file synthesized from sequence entry)
1 4
2 12
3 42
4 106
5 300
6 654
7 1664
8 3300
9 7940
10 15018
11 34948
12 64396
13 147130
14 267404
15 604722
16 1090998
17 2453492
18 4409000
19 9886266
20 17729222