n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 33 |
3 | 220 |
4 | 1005 |
5 | 3456 |
6 | 9709 |
7 | 23528 |
8 | 50985 |
9 | 101260 |
10 | 187561 |
11 | 328164 |
12 | 547573 |
13 | 877800 |
14 | 1359765 |
15 | 2044816 |
16 | 2996369 |
17 | 4291668 |
18 | 6023665 |
19 | 8303020 |
20 | 11260221 |
21 | 15047824 |
22 | 19842813 |
23 | 25849080 |
24 | 33300025 |
25 | 42461276 |
26 | 53633529 |
27 | 67155508 |
28 | 83407045 |
29 | 102812280 |
30 | 125842981 |
[1,4,33,220,1005,3456,9709,23528,50985,101260, 187561,328164,547573,877800,1359765,2044816, 2996369,4291668,6023665,8303020,11260221,15047824, 19842813,25849080,33300025,42461276,53633529, 67155508,83407045,102812280,125842981] |