# A328866 (b-file synthesized from sequence entry)
0 1
1 3
2 15
3 105
4 945
5 4158
6 75075
7 579150
8 34459425
9 339489150
10 16499172690
11 1724913508500
12 878428175625
13 131358797955000
14 252664626678750
15 3891675750482520
16 221643095476699771875
17 208605266331011550000
18 32498195069133543750
19 807994071847270157850000
20 125885476393804690593030