# A318245 (b-file synthesized from sequence entry)
0 1
1 12
2 180
3 2928
4 49860
5 875952
6 15754704
7 288722880
8 5373771876
9 101334517680
10 1932405892560
11 37208369165760
12 722497419680400
13 14132680228175040
14 278236490874120000
15 5508974545258860288
16 109624581377872629156
17 2191185332414847848880
18 43971545517545956240464