# A218376 (b-file synthesized from sequence entry)
0 0
1 1
2 37
3 428
4 3164
5 18945
6 102501
7 529312
8 2679328
9 13455689
10 67378445
11 337053276
12 1685515212
13 8427947353
14 42140274589
15 210702132320
16 1053511710176
17 5267559970737
18 26337801743253
19 131689011192364
20 658445059161820