# A107233 (b-file synthesized from sequence entry)
0 0
1 1
2 8
3 30
4 96
5 270
6 720
7 1820
8 4480
9 10710
10 25200
11 58212
12 133056
13 300300
14 672672
15 1492920
16 3294720
17 7220070
18 15752880
19 34179860
20 73902400
21 159074916
22 341429088
23 730122120
24 1557593856
25 3312591100
26 7030805600
27 14883258600
28 31451414400