# A052567 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 48
4 504
5 6600
6 103680
7 1900080
8 39795840
9 937681920
10 24548832000
11 706966444800
12 22210346188800
13 755916735974400
14 27706219904563200
15 1088037381150720000
16 45576301518139392000
17 2028445209752113152000
18 95589693062063456256000
19 4754884242802394308608000