# A000555 (b-file synthesized from sequence entry)
5 60
6 720
7 6090
8 47040
9 363384
10 2913120
11 24560910
12 218386080
13 2044958916
14 20112075984
15 207161237010
16 2228884869120
17 24989300398320
18 291322535242176
19 3524580157816854
20 44176838981652000
21 572725044049055100
22 7668896804089696560
23 105920137922879314650
24 1507138839384235136640
25 22068265782102952223400
26 332178010291171425732000
27 5135009134117954527323550
28 81449458937043220255508640