# A007465 (b-file synthesized from sequence entry)
0 1
1 6
2 30
3 128
4 486
5 1692
6 5512
7 17040
8 50496
9 144512
10 401664
11 1089024
12 2890240
13 7529472
14 19298304
15 48754688
16 121602048
17 299827200
18 731643904
19 1768685568
20 4239261696
21 10081796096
22 23805296640
23 55839817728
24 130187001856
25 301813727232
26 696036360192
27 1597358735360