# A153366 (b-file synthesized from sequence entry)
1 5
2 16
3 56
4 200
5 720
6 2600
7 9400
8 34000
9 123000
10 445000
11 1610000
12 5825000
13 21075000
14 76250000
15 275875000
16 998125000
17 3611250000
18 13065625000
19 47271875000
20 171031250000
21 618796875000
22 2238828125000
23 8100156250000
24 29306640625000