# A048349 (b-file synthesized from sequence entry)
1 2
2 12
3 38
4 212
5 2538
6 6888
7 66592
8 210771
9 2059962
10 6696592
11 21081538
12 209868112
13 664488107
14 3800598038
15 18613286762
16 209820981888
17 666669703412
18 666516649788
19 6666894662768
20 49400874945738