# A045630 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 9
4 32
5 125
6 450
7 1715
8 6400
9 24300
10 92250
11 352715
12 1351584
13 5200299
14 20056582
15 77558625
16 300533760
17 1166803109
18 4537542888
19 17672631899
20 68923172000
21 269128935495
22 1052049129142
23 4116715363799
24 16123800483072