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 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 1 |
| 5 | 17 |
| 6 | 9 |
| 7 | 83 |
| 8 | 201 |
| 9 | 2089 |
| 10 | 2341 |
| 11 | 551 |
| 12 | 2861 |
| 13 | 64913 |
| 14 | 90653 |
| 15 | 114677 |
| 16 | 274399 |
| 17 | 5385503 |
| 18 | 2022061 |
| 19 | 42503239 |
| 20 | 9276623 |
| 21 | 3338549 |
| 22 | 3573693 |
| 23 | 87368107 |
| 24 | 276977179 |
| 25 | 7281378067 |
| 26 | 7624597867 |
| 27 | 71595952403 |
| 28 | 74464289303 |
| 29 | 2239777822987 |