# A198860 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 17
4 144
5 1634
6 23312
7 401274
8 8096680
9 187472136
10 4900535832
11 142766286552
12 4587190461840
13 161161214978880
14 6146415080939520
15 252902928346825104
16 11167368115492742400
17 526752556713346955520
18 26433830208985721222400
19 1406218428780691953635712