n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 15 |
4 | 82 |
5 | 457 |
6 | 3231 |
7 | 24055 |
8 | 209375 |
9 | 1955288 |
10 | 20455936 |
11 | 229830841 |
12 | 2828166755 |
13 | 37228913365 |
14 | 528635368980 |
15 | 7990596990430 |
16 | 128909374528433 |
17 | 2202090635802581 |
18 | 39837079499488151 |
19 | 759320365206705013 |
20 | 15234890522990662422 |
21 | 320634889654149218205 |
22 | 7068984425261215971205 |
[1,4,15,82,457,3231,24055,209375,1955288,20455936, 229830841,2828166755,37228913365,528635368980, 7990596990430,128909374528433,2202090635802581, 39837079499488151,759320365206705013, 15234890522990662422,320634889654149218205, 7068984425261215971205] |