# A016249 (b-file synthesized from sequence entry)
0 1
1 16
2 185
3 1880
4 17841
5 162336
6 1435945
7 12448360
8 106312481
9 897579056
10 7510186905
11 62388376440
12 515255179921
13 4235078618176
14 34671889197065
15 282913935338120
16 2302083235036161
17 18688068146607696
18 151404361037090425
19 1224533599346325400
20 9889359772117817201