# A094261 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 12
5 40
6 90
7 168
8 560
9 1296
10 2520
11 4400
12 14256
13 32760
14 64064
15 113400
16 187200
17 586432
18 1321920
19 2560896
20 4522000
21 7484400
22 11797632
23 35784320
24 78871968
25 150480000
26 263120000
27 433060992
28 681080400
29 1033305728
30 3044304000