# A000504 (b-file synthesized from sequence entry)
1 1
2 56
3 1918
4 56980
5 1636635
6 47507460
7 1422280860
8 44346982680
9 1446733012725
10 49473074851200
11 1774073543492250
12 66681131440423500
13 2624634287988087375
14 108060337458000427500
15 4647703259223579555000
16 208548093035794902390000
17 9749651260035434678555625