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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 31 |
| 3 | 301 |
| 4 | 1701 |
| 5 | 6951 |
| 6 | 22827 |
| 7 | 63987 |
| 8 | 159027 |
| 9 | 359502 |
| 10 | 752752 |
| 11 | 1479478 |
| 12 | 2757118 |
| 13 | 4910178 |
| 14 | 8408778 |
| 15 | 13916778 |
| 16 | 22350954 |
| 17 | 34952799 |
| 18 | 53374629 |
| 19 | 79781779 |
| 20 | 116972779 |
| 21 | 168519505 |
| 22 | 238929405 |
| 23 | 333832005 |
| 24 | 460192005 |
| 25 | 626551380 |
| 26 | 843303006 |
| 27 | 1122998436 |
| 28 | 1480692556 |