# A025183 (b-file synthesized from sequence entry)
1 0
2 4
3 20
4 111
5 616
6 3465
7 19668
8 112476
9 647088
10 3741156
11 21718520
12 126520240
13 739225704
14 4330188265
15 25421864580
16 149541718275
17 881200519200
18 5200715525016
19 30736780735752
20 181886951796886