n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 11 |
4 | 42 |
5 | 132 |
6 | 520 |
7 | 1761 |
8 | 6970 |
9 | 24604 |
10 | 97740 |
11 | 353886 |
12 | 1408456 |
13 | 5186830 |
14 | 20673334 |
15 | 77060191 |
16 | 307402490 |
17 | 1156225566 |
18 | 4615394884 |
19 | 17481280422 |
20 | 69812708258 |
21 | 265891539128 |
22 | 1062228300604 |
23 | 4063922007022 |
24 | 16239378774724 |
25 | 62361864245180 |
26 | 249247207795482 |
27 | 960167359575770 |
28 | 3838172631009646 |
[1,1,4,11,42,132,520,1761,6970,24604,97740,353886, 1408456,5186830,20673334,77060191,307402490, 1156225566,4615394884,17481280422,69812708258, 265891539128,1062228300604,4063922007022, 16239378774724,62361864245180,249247207795482, 960167359575770,3838172631009646] |