n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 31 |
5 | 127 |
6 | 494 |
7 | 1994 |
8 | 8040 |
9 | 32741 |
10 | 133855 |
11 | 549775 |
12 | 2266756 |
13 | 9372300 |
14 | 38862245 |
15 | 161500403 |
16 | 672538548 |
17 | 2805669061 |
18 | 11723319333 |
19 | 49055511943 |
20 | 205534846202 |
21 | 862167483656 |
22 | 3620429584614 |
23 | 15217780335870 |
24 | 64022149180478 |
25 | 269566679312520 |
26 | 1135878674712355 |
[1,1,2,9,31,127,494,1994,8040,32741,133855,549775, 2266756,9372300,38862245,161500403,672538548, 2805669061,11723319333,49055511943,205534846202, 862167483656,3620429584614,15217780335870, 64022149180478,269566679312520,1135878674712355] |