# A024963 (b-file synthesized from sequence entry)
1 3
2 1
3 2
4 6
5 18
6 58
7 186
8 594
9 1898
10 6390
11 21402
12 71350
13 237522
14 824130
15 2840594
16 9735090
17 33326370
18 117518870
19 412260450
20 1439364870
21 5017074450
22 17912831754
23 63634522842
24 225032003602
25 794803982874
26 2859133321638
27 10244767026810
28 36572931177942