# A003225 (b-file synthesized from sequence entry)
3 1
4 3
5 9
6 89
7 1705
8 67750
9 3771993
10 274460137
11 24940556932
12 2766249007425
13 367696475451179
14 57702068070938071
15 10555631209951650809
16 2226578454651253107758
17 536474432232188713033347
18 146427715863075641229151764
19 44945602048024898356307332914