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 | 2 |
| 2 | 3 |
| 3 | 12 |
| 4 | 29 |
| 5 | 88 |
| 6 | 239 |
| 7 | 684 |
| 8 | 1909 |
| 9 | 5392 |
| 10 | 15143 |
| 11 | 42644 |
| 12 | 119933 |
| 13 | 337512 |
| 14 | 949535 |
| 15 | 2671740 |
| 16 | 7517061 |
| 17 | 21150272 |
| 18 | 59508247 |
| 19 | 167433188 |
| 20 | 471090573 |
| 21 | 1325464216 |
| 22 | 3729333775 |
| 23 | 10492879052 |
| 24 | 29522830997 |
| 25 | 83065631600 |
| 26 | 233713998087 |
| 27 | 657579228980 |