# A222973 (b-file synthesized from sequence entry)
1 1
2 20
3 1884
4 37680
5 1492176
6 26342820
7 810566001
8 14317221700
9 374392387808
10 6675906932160
11 162189676788683
12 2927729818922000
13 67871228115916800
14 1241683361279242560