n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 27 |
4 | 115 |
5 | 494 |
6 | 2199 |
7 | 9999 |
8 | 45977 |
9 | 213553 |
10 | 1001518 |
11 | 4728343 |
12 | 22440120 |
13 | 106995630 |
14 | 512350724 |
15 | 2461339951 |
16 | 11857180503 |
17 | 57274958341 |
18 | 277281579581 |
19 | 1344921183407 |
20 | 6535047490259 |
21 | 31805222581625 |
22 | 155007158817484 |
23 | 756405069981852 |
24 | 3695465159418088 |
25 | 18073604576901871 |
26 | 88477876035516269 |
[1,2,7,27,115,494,2199,9999,45977,213553,1001518, 4728343,22440120,106995630,512350724,2461339951, 11857180503,57274958341,277281579581, 1344921183407,6535047490259,31805222581625, 155007158817484,756405069981852,3695465159418088, 18073604576901871,88477876035516269] |