n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 8 |
5 | 20 |
6 | 54 |
7 | 152 |
8 | 464 |
9 | 1532 |
10 | 5334 |
11 | 19764 |
12 | 77042 |
13 | 316760 |
14 | 1361630 |
15 | 6129422 |
16 | 28709012 |
17 | 139999730 |
18 | 707500404 |
19 | 3705539918 |
20 | 20045427240 |
21 | 111972406422 |
22 | 644198989898 |
23 | 3815636759538 |
24 | 23221092882642 |
25 | 145131413157282 |
[1,2,4,8,20,54,152,464,1532,5334,19764,77042, 316760,1361630,6129422,28709012,139999730, 707500404,3705539918,20045427240,111972406422, 644198989898,3815636759538,23221092882642, 145131413157282] |