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 | 12 |
| 1 | 13 |
| 2 | 25 |
| 3 | 188 |
| 4 | 213 |
| 5 | 1253 |
| 6 | 2719 |
| 7 | 3972 |
| 8 | 6691 |
| 9 | 10663 |
| 10 | 17354 |
| 11 | 45371 |
| 12 | 244209 |
| 13 | 289580 |
| 14 | 2271269 |
| 15 | 2560849 |
| 16 | 4832118 |
| 17 | 118531681 |
| 18 | 123363799 |
| 19 | 241895480 |
| 20 | 1816632159 |
| 21 | 2058527639 |
| 22 | 12109270354 |
| 23 | 26277068347 |