n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 6 |
7 | 25 |
8 | 92 |
9 | 341 |
10 | 1225 |
11 | 4366 |
12 | 15522 |
13 | 55312 |
14 | 197965 |
15 | 712244 |
16 | 2577106 |
17 | 9375361 |
18 | 34284972 |
19 | 125977465 |
20 | 464938190 |
21 | 1722817416 |
22 | 6407307544 |
23 | 23909159418 |
24 | 89491715106 |
25 | 335908316845 |
26 | 1264097675776 |
27 | 4768430557021 |
[1,1,1,1,2,6,25,92,341,1225,4366,15522,55312, 197965,712244,2577106,9375361,34284972,125977465, 464938190,1722817416,6407307544,23909159418, 89491715106,335908316845,1264097675776, 4768430557021] |