# A003474 (b-file synthesized from sequence entry)
1 1
2 4
3 18
4 32
5 160
6 324
7 1456
8 2048
9 13122
10 25600
11 117128
12 209952
13 913952
14 2119936
15 9447840
16 13107200
17 86093440
18 172186884
19 774840976
20 1310720000
21 6964002864
22 13718968384
23 62761410632
24 88159684608
25 557885504000
26 835308258304
27 5083731656658
28 8988257288192
29 45753584909920
30 89261680665600
31 411782264189296
32 564050001920000