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 | 3 |
| 3 | 7 |
| 4 | 35 |
| 5 | 21 |
| 6 | 259 |
| 7 | 1241 |
| 8 | 5497 |
| 9 | 475 |
| 10 | 19367 |
| 11 | 7473 |
| 12 | 54193 |
| 13 | 307727 |
| 14 | 485041 |
| 15 | 1109501 |
| 16 | 9353753 |
| 17 | 7870991 |
| 18 | 189509941 |
| 19 | 1048445929 |
| 20 | 4213673063 |
| 21 | 96924859 |
| 22 | 68325181 |
| 23 | 3156755829 |
| 24 | 113847868229 |
| 25 | 3353128913 |
| 26 | 614935296797 |
| 27 | 120633624344 |
| 28 | 1937548941997 |
| 29 | 70096529185 |
| 30 | 62887637910847 |