# A024741 (b-file synthesized from sequence entry)
1 2
2 1
3 3
4 6
5 12
6 24
7 66
8 168
9 408
10 1014
11 2820
12 7656
13 20370
14 54096
15 154416
16 430710
17 1182504
18 3258816
19 9377922
20 26651328
21 74941608
22 210709446
23 612566616
24 1760983512
25 5017273554
26 14308403856
27 41833393896
28 121321861350
29 349444725492
30 1006135834560