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 | 4 |
| 2 | 9 |
| 3 | 15 |
| 4 | 111 |
| 5 | 141 |
| 6 | 237 |
| 7 | 27663 |
| 8 | 27667 |
| 9 | 3066878 |
| 10 | 3066893 |
| 11 | 3067023 |
| 12 | 3067033 |
| 13 | 3067073 |
| 14 | 3067193 |
| 15 | 3067243 |
| 16 | 3067273 |
| 17 | 3067283 |
| 18 | 3067543 |
| 19 | 3067598 |
| 20 | 3067613 |
| 21 | 3067663 |
| 22 | 3067798 |
| 23 | 3067843 |
| 24 | 3067853 |
| 25 | 3067913 |
| 26 | 3067933 |
| 27 | 3067993 |
| 28 | 348933171 |
| 29 | 348933219 |
| 30 | 348933297 |