# A247304 (b-file synthesized from sequence entry)
1 1
2 3
3 15
4 105
5 945
6 10263
7 127699
8 1751685
9 25807445
10 401449271
11 6519160851
12 109656966853
13 1899821492925
14 33757439931675
15 613135175204151
16 11352879180474205
17 213825919244349885
18 4089023317563827335
19 79269914519539177315
20 1555788699527063688453