# A274257 (b-file synthesized from sequence entry)
0 1
1 5
2 52
3 880
4 17856
5 399296
6 9491008
7 235274240
8 6014201600
9 157387037696
10 4195621863424
11 113534211297280
12 3110485641494528
13 86107512380129280
14 2404899661362184192
15 67680890349732102144
16 1917436905101367443456
17 54640222663002565640192
18 1565130555077611323392000
19 45039415225401829826232320