This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 41 |
| 4 | 509 |
| 5 | 8469 |
| 6 | 176217 |
| 7 | 4400325 |
| 8 | 128203049 |
| 9 | 4268957449 |
| 10 | 159922273421 |
| 11 | 6656731517249 |
| 12 | 304797275277365 |
| 13 | 15224868078068845 |
| 14 | 823874409422614577 |
| 15 | 48012621942105876301 |
| 16 | 2997884066292303095889 |
| 17 | 199666128081901473290833 |
| 18 | 14129411123649333432720277 |
| 19 | 1058688691179737704258634521 |
| 20 | 83732563305101190468369022317 |
| 21 | 6971039973751002759723517967941 |