n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 15 |
4 | 40 |
5 | 377 |
6 | 1026 |
7 | 9775 |
8 | 26624 |
9 | 253761 |
10 | 691186 |
11 | 6587999 |
12 | 17944200 |
13 | 171034201 |
14 | 465858002 |
15 | 4440301215 |
16 | 12094363840 |
17 | 115276797377 |
18 | 313987601826 |
19 | 2992756430575 |
20 | 8151583283624 |
21 | 77696390397561 |
22 | 211627177772386 |
23 | 2017113393905999 |
24 | 5494155038798400 |
[1,2,15,40,377,1026,9775,26624,253761,691186, 6587999,17944200,171034201,465858002,4440301215, 12094363840,115276797377,313987601826, 2992756430575,8151583283624,77696390397561, 211627177772386,2017113393905999,5494155038798400] |