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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 31 |
| 5 | 125 |
| 6 | 579 |
| 7 | 3009 |
| 8 | 17255 |
| 9 | 108005 |
| 10 | 731883 |
| 11 | 5331625 |
| 12 | 41501135 |
| 13 | 343405709 |
| 14 | 3007557523 |
| 15 | 27775308049 |
| 16 | 269603741111 |
| 17 | 2742598070709 |
| 18 | 29164361115067 |
| 19 | 323444222468089 |
| 20 | 3733412864370975 |
| 21 | 44767318872513885 |
| 22 | 556707323098632547 |
| 23 | 7168524182698345313 |