# A028214 (b-file synthesized from sequence entry)
0 1
1 36
2 820
3 15120
4 246736
5 3721536
6 53174080
7 730794240
8 9758653696
9 127501710336
10 1638112752640
11 20771546664960
12 260668843872256
13 3244288806567936
14 40111449573376000
15 493276560759521280
16 6039827824481468416
17 73691981266726158336
18 896516001844367196160