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 | 14 |
| 3 | 28 |
| 4 | 52 |
| 5 | 268 |
| 6 | 364 |
| 7 | 1876 |
| 8 | 3484 |
| 9 | 5356 |
| 10 | 7294 |
| 11 | 24388 |
| 12 | 66788 |
| 13 | 283276 |
| 14 | 286492 |
| 15 | 339556 |
| 16 | 404236 |
| 17 | 860692 |
| 18 | 1153684 |
| 19 | 1381132 |
| 20 | 1478764 |
| 21 | 1696708 |
| 22 | 2073722 |
| 23 | 2182726 |
| 24 | 2222122 |
| 25 | 4922164 |
| 26 | 7790146 |
| 27 | 8200036 |
| 28 | 9679138 |
| 29 | 10881052 |
| 30 | 14863516 |
| 31 | 15476266 |