n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 28 |
5 | 278 |
6 | 3554 |
7 | 55382 |
8 | 1015750 |
9 | 21401830 |
10 | 508932130 |
11 | 13475090126 |
12 | 393026736854 |
13 | 12518884854734 |
14 | 432357148756210 |
15 | 16092438499462630 |
16 | 642170913160160710 |
17 | 27351173629037613494 |
18 | 1238472705706192189442 |
19 | 59411223892666111129022 |
20 | 3010044856761072109710262 |
[1,1,4,28,278,3554,55382,1015750,21401830, 508932130,13475090126,393026736854,12518884854734, 432357148756210,16092438499462630, 642170913160160710,27351173629037613494, 1238472705706192189442,59411223892666111129022, 3010044856761072109710262] |