n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 12 |
4 | 30 |
5 | 76 |
6 | 197 |
7 | 520 |
8 | 1398 |
9 | 3820 |
10 | 10594 |
11 | 29768 |
12 | 84620 |
13 | 243000 |
14 | 704045 |
15 | 2055760 |
16 | 6043750 |
17 | 17875020 |
18 | 53148310 |
19 | 158773320 |
20 | 476311940 |
21 | 1434313960 |
22 | 4333867170 |
23 | 13135533552 |
24 | 39924668220 |
25 | 121661345656 |
26 | 371612931492 |
[1,2,5,12,30,76,197,520,1398,3820,10594,29768, 84620,243000,704045,2055760,6043750,17875020, 53148310,158773320,476311940,1434313960, 4333867170,13135533552,39924668220,121661345656, 371612931492] |