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 | 9 |
| 2 | 81 |
| 3 | 283 |
| 4 | 1004 |
| 5 | 3939 |
| 6 | 15495 |
| 7 | 62530 |
| 8 | 253747 |
| 9 | 1040401 |
| 10 | 4290258 |
| 11 | 17800079 |
| 12 | 74193193 |
| 13 | 310541536 |
| 14 | 1304248843 |
| 15 | 5493846571 |
| 16 | 23198279836 |
| 17 | 98159361513 |
| 18 | 416061031363 |
| 19 | 1766079438934 |
| 20 | 7505644908143 |
| 21 | 31930399614415 |
| 22 | 135952464116764 |