# A084715 (b-file synthesized from sequence entry)
2 3
3 4
4 9
5 36
6 25
7 120
8 105
9 280
10 441
11 2520
12 385
13 277200
14 70785
15 56056
16 585585
17 5045040
18 1446445
19 183783600
20 8729721
21 40646320
22 1322685
23 4655851200
24 37182145
25 1070845776
26 900951975
27 5949143200
28 6453758025
29 80313433200
30 215656441