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 | 4 |
| 2 | 8 |
| 3 | 10 |
| 4 | 20 |
| 5 | 40 |
| 6 | 344 |
| 7 | 4870 |
| 8 | 6892 |
| 9 | 17230 |
| 10 | 68920 |
| 11 | 250820 |
| 12 | 296440 |
| 13 | 317032 |
| 14 | 368722 |
| 15 | 369370 |
| 16 | 451426 |
| 17 | 472312 |
| 18 | 473240 |
| 19 | 632270 |
| 20 | 2326472 |
| 21 | 3186730 |
| 22 | 3429190 |
| 23 | 4438760 |
| 24 | 4670956 |
| 25 | 4948456 |
| 26 | 5509540 |
| 27 | 8990356 |
| 28 | 11817604 |
| 29 | 11841436 |
| 30 | 13094342 |
| 31 | 17668360 |