n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 21 |
5 | 30 |
6 | 180 |
7 | 546 |
8 | 140 |
9 | 1430 |
10 | 6120 |
11 | 17710 |
12 | 630 |
13 | 10920 |
14 | 65835 |
15 | 245700 |
16 | 695640 |
17 | 2772 |
18 | 81396 |
19 | 690690 |
20 | 3322704 |
21 | 11515140 |
22 | 32212719 |
23 | 12012 |
24 | 596904 |
25 | 7125300 |
26 | 44170896 |
27 | 187336380 |
28 | 619851960 |
29 | 1721286532 |
30 | 51480 |
31 | 4326300 |
32 | 72624816 |
[1,6,21,30,180,546,140,1430,6120,17710,630,10920, 65835,245700,695640,2772,81396,690690,3322704, 11515140,32212719,12012,596904,7125300,44170896, 187336380,619851960,1721286532,51480,4326300, 72624816] |