# A377532 (b-file synthesized from sequence entry)
0 1
1 0
2 6
3 18
4 180
5 1500
6 15930
7 191646
8 2580648
9 38683224
10 636068430
11 11392350090
12 220658360076
13 4594593295188
14 102333126352002
15 2427278515815510
16 61079333377870800
17 1625065147997303856
18 45576552142354413078
19 1343802083242003570818
20 41552482139458105525620