n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 11 |
4 | 38 |
5 | 126 |
6 | 415 |
7 | 1369 |
8 | 4521 |
9 | 14933 |
10 | 49322 |
11 | 162900 |
12 | 538021 |
13 | 1776961 |
14 | 5868903 |
15 | 19383671 |
16 | 64019918 |
17 | 211443426 |
18 | 698350195 |
19 | 2306494009 |
20 | 7617832221 |
21 | 25159990673 |
22 | 83097804242 |
23 | 274453403400 |
24 | 906458014441 |
25 | 2993827446721 |
26 | 9887940354603 |
27 | 32657648510531 |
[1,1,3,11,38,126,415,1369,4521,14933,49322,162900, 538021,1776961,5868903,19383671,64019918, 211443426,698350195,2306494009,7617832221, 25159990673,83097804242,274453403400,906458014441, 2993827446721,9887940354603,32657648510531] |