n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 30 |
5 | 109 |
6 | 420 |
7 | 1685 |
8 | 6960 |
9 | 29391 |
10 | 126291 |
11 | 550359 |
12 | 2426502 |
13 | 10803801 |
14 | 48507843 |
15 | 219377949 |
16 | 998436792 |
17 | 4569488371 |
18 | 21016589073 |
19 | 97090411019 |
20 | 450314942682 |
21 | 2096122733211 |
22 | 9788916220518 |
23 | 45850711498859 |
24 | 215348942668680 |
25 | 1013979873542689 |
26 | 4785437476592805 |
27 | 22633143884165985 |
28 | 107258646298581390 |
[0,1,3,9,30,109,420,1685,6960,29391,126291,550359, 2426502,10803801,48507843,219377949,998436792, 4569488371,21016589073,97090411019,450314942682, 2096122733211,9788916220518,45850711498859, 215348942668680,1013979873542689,4785437476592805, 22633143884165985,107258646298581390] |