# A371147 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 6
4 12
5 40
6 2700
7 21168
8 173040
9 7611840
10 125415360
11 1848591360
12 71211998880
13 1844075600640
14 41500836336960
15 1609925690419200
16 55708371912211200
17 1719475797882286080
18 72091120665964654080
19 3046645011228998860800
20 119757727692451283097600