# A012258 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 4
4 13
5 84
6 469
7 4152
8 32985
9 370128
10 3818601
11 51861888
12 658371429
13 10494283968
14 158197312701
15 2894815734912
16 50529852678321
17 1043916757274880
18 20707179214389201
19 476720372375608320