# A249928 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 42
4 530
5 7489
6 113289
7 1794784
8 29397876
9 493818165
10 8460325159
11 147264321834
12 2596986868762
13 46299572773077
14 833111268412360
15 15110637698827976
16 275970530427257207
17 5070759797283817869
18 93671715612197557390
19 1738657226550598494420
20 32409645286487921390715