# A381480 (b-file synthesized from sequence entry)
0 1
1 2
2 14
3 174
4 3168
5 76450
6 2304720
7 83473726
8 3533382272
9 171254814210
10 9355068840960
11 568799458870478
12 38102773549750272
13 2788540163472852386
14 221380225364522119168
15 18950242574522637197790
16 1739955233454599038402560
17 170582215179135413189856514
18 17785491645892269582026145792