n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 19 |
5 | 68 |
6 | 269 |
7 | 1168 |
8 | 5516 |
9 | 28117 |
10 | 153668 |
11 | 895345 |
12 | 5534292 |
13 | 36137736 |
14 | 248364343 |
15 | 1790801964 |
16 | 13508326353 |
17 | 106329846806 |
18 | 871423555238 |
19 | 7420685528453 |
20 | 65539734707912 |
21 | 599363070599885 |
22 | 5666859173305898 |
23 | 55317197561841526 |
24 | 556788566486730535 |
[1,1,2,6,19,68,269,1168,5516,28117,153668,895345, 5534292,36137736,248364343,1790801964,13508326353, 106329846806,871423555238,7420685528453, 65539734707912,599363070599885,5666859173305898, 55317197561841526,556788566486730535] |