# A281231 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 23
4 133
5 916
6 7107
7 61286
8 580505
9 5968400
10 66032901
11 780962524
12 9817927385
13 130572957724
14 1829676460991
15 26919714974436
16 414591408939313
17 6665930432840304
18 111624874150941193
19 1942675652654112012
20 35071252458352443001
21 655641049733709757516