n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 23 |
7 | 65 |
8 | 199 |
9 | 654 |
10 | 2296 |
11 | 8569 |
12 | 33825 |
13 | 140581 |
14 | 612933 |
15 | 2795182 |
16 | 13298464 |
17 | 65852873 |
18 | 338694479 |
19 | 1805812309 |
20 | 9963840219 |
21 | 56807228074 |
22 | 334192384460 |
23 | 2026044619017 |
24 | 12642938684817 |
25 | 81118550133657 |
26 | 534598577947465 |
27 | 3615474317688778 |
28 | 25070063421597484 |
[1,1,1,2,4,9,23,65,199,654,2296,8569,33825,140581, 612933,2795182,13298464,65852873,338694479, 1805812309,9963840219,56807228074,334192384460, 2026044619017,12642938684817,81118550133657, 534598577947465,3615474317688778, 25070063421597484] |