# A073949 (b-file synthesized from sequence entry)
1 0
2 2
3 6
4 12
5 30
6 90
7 252
8 702
9 2106
10 6480
11 19602
12 58806
13 176904
14 532170
15 1596510
16 4785156
17 14351094
18 43053282
19 129146724
20 387400806
21 1162202418
22 3486725352
23 10460294154
24 31380882462
25 94143001680
26 282430067922
27 847290203766
28 2541867422652
29 7625599079310