# A143553 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 14
4 50
5 432
6 1818
7 17082
8 77714
9 763967
10 3637718
11 36786268
12 180481258
13 1860798032
14 9324573430
15 97502825964
16 496344066386
17 5245970686152
18 27032002846992
19 288124627083382
20 1499144278319270
21 16087838913122064