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 | 19 |
| 2 | 45 |
| 3 | 103 |
| 4 | 239 |
| 5 | 553 |
| 6 | 1281 |
| 7 | 2967 |
| 8 | 6873 |
| 9 | 15921 |
| 10 | 36881 |
| 11 | 85435 |
| 12 | 197911 |
| 13 | 458463 |
| 14 | 1062035 |
| 15 | 2460217 |
| 16 | 5699123 |
| 17 | 13202089 |
| 18 | 30582803 |
| 19 | 70845443 |
| 20 | 164114349 |
| 21 | 380172929 |
| 22 | 880675315 |
| 23 | 2040095313 |
| 24 | 4725906149 |
| 25 | 10947620333 |
| 26 | 25360298571 |
| 27 | 58747446847 |