n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 9 |
3 | 45 |
4 | 201 |
5 | 819 |
6 | 3357 |
7 | 13329 |
8 | 52215 |
9 | 199686 |
10 | 750733 |
11 | 2774793 |
12 | 10112184 |
13 | 36357280 |
14 | 129131448 |
15 | 453379226 |
16 | 1574884565 |
17 | 5415956550 |
18 | 18450934294 |
19 | 62303210591 |
20 | 208624947952 |
21 | 693066815809 |
22 | 2285129922950 |
23 | 7480504628754 |
24 | 24320897894515 |
25 | 78557786077315 |
[1,1,9,45,201,819,3357,13329,52215,199686,750733, 2774793,10112184,36357280,129131448,453379226, 1574884565,5415956550,18450934294,62303210591, 208624947952,693066815809,2285129922950, 7480504628754,24320897894515,78557786077315] |