# A000552 (b-file synthesized from sequence entry)
4 24
5 300
6 3360
7 38850
8 475776
9 6231960
10 87530400
11 1316954430
12 21173760960
13 362670636900
14 6596214691248
15 126980000240730
16 2579214238608000
17 55118036257959600
18 1235935135837111104
19 29009023670878484598