n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 11 |
4 | 47 |
5 | 172 |
6 | 725 |
7 | 2945 |
8 | 12592 |
9 | 53607 |
10 | 233115 |
11 | 1017428 |
12 | 4488097 |
13 | 19893325 |
14 | 88746008 |
15 | 397610355 |
16 | 1789394067 |
17 | 8081593288 |
18 | 36622787565 |
19 | 166442457597 |
20 | 758467464848 |
21 | 3464526761611 |
22 | 15859854880999 |
23 | 72747086739548 |
24 | 334290271569069 |
25 | 1538717057137809 |
26 | 7093579418490760 |
[1,1,4,11,47,172,725,2945,12592,53607,233115, 1017428,4488097,19893325,88746008,397610355, 1789394067,8081593288,36622787565,166442457597, 758467464848,3464526761611,15859854880999, 72747086739548,334290271569069,1538717057137809, 7093579418490760] |