n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 21 |
4 | 142 |
5 | 1175 |
6 | 11476 |
7 | 129073 |
8 | 1641802 |
9 | 23292459 |
10 | 364530688 |
11 | 6237123365 |
12 | 115806988342 |
13 | 2318774566303 |
14 | 49799220552940 |
15 | 1141845310143897 |
16 | 27838573420105762 |
17 | 719091858410591507 |
18 | 19617132273844278232 |
19 | 563588641924040326669 |
20 | 17007875120002223426062 |
[1,1,4,21,142,1175,11476,129073,1641802,23292459, 364530688,6237123365,115806988342,2318774566303, 49799220552940,1141845310143897,27838573420105762, 719091858410591507,19617132273844278232, 563588641924040326669,17007875120002223426062] |