# A004141 (b-file synthesized from sequence entry)
1 1
2 2
3 8
4 48
5 256
6 1280
7 6912
8 39424
9 212992
10 1118208
11 6553600
12 36765696
13 199229440
14 1133117440
15 6499598336
16 36175872000
17 200655503360
18 1167945891840
19 6620826304512
20 36681168191488
21 212364657950720
22 1219998345330688
23 6864598984556544
24 38958828003262464
25 226089827240509440
26 1287455960675123200