# A073948 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 6
5 30
6 90
7 252
8 756
9 2268
10 6642
11 19602
12 58806
13 176904
14 530712
15 1592136
16 4780782
17 14351094
18 43053282
19 129146724
20 387440172
21 1162320516
22 3486843450
23 10460294154
24 31380882462
25 94143001680
26 282429005040
27 847287015120
28 2541864234006
29 7625599079310