# A247651 (b-file synthesized from sequence entry)
0 1
1 2
2 3
3 12
4 30
5 60
6 210
7 840
8 2520
9 7560
10 27720
11 83160
12 240240
13 840840
14 2702700
15 10810800
16 36756720
17 122522400
18 465585120
19 1551950400
20 4888643760
21 19554575040
22 74959204320
23 257002986240
24 936990054000
25 3480248772000