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 | 10 |
| 3 | 19 |
| 4 | 31 |
| 5 | 61 |
| 6 | 211 |
| 7 | 181 |
| 8 | 361 |
| 9 | 631 |
| 10 | 841 |
| 11 | 1261 |
| 12 | 5461 |
| 13 | 2521 |
| 14 | 6931 |
| 15 | 18481 |
| 16 | 20791 |
| 17 | 13861 |
| 18 | 27721 |
| 19 | 41581 |
| 20 | 83161 |
| 21 | 138601 |
| 22 | 245701 |
| 23 | 235621 |
| 24 | 180181 |
| 25 | 556921 |
| 26 | 360361 |
| 27 | 540541 |
| 28 | 1670761 |
| 29 | 1081081 |
| 30 | 1413721 |
| 31 | 2162161 |
| 32 | 3603601 |
| 33 | 4324321 |
| 34 | 3063061 |