n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 31 |
6 | 110 |
7 | 421 |
8 | 1686 |
9 | 6961 |
10 | 29392 |
11 | 126292 |
12 | 550360 |
13 | 2426503 |
14 | 10803802 |
15 | 48507844 |
16 | 219377950 |
17 | 998436793 |
18 | 4569488372 |
19 | 21016589074 |
20 | 97090411020 |
21 | 450314942683 |
22 | 2096122733212 |
23 | 9788916220519 |
24 | 45850711498860 |
25 | 215348942668681 |
26 | 1013979873542690 |
27 | 4785437476592806 |
[0,1,2,4,10,31,110,421,1686,6961,29392,126292, 550360,2426503,10803802,48507844,219377950, 998436793,4569488372,21016589074,97090411020, 450314942683,2096122733212,9788916220519, 45850711498860,215348942668681,1013979873542690, 4785437476592806] |