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 | 1 |
| 1 | 15 |
| 2 | 129 |
| 3 | 547 |
| 4 | 1593 |
| 5 | 3711 |
| 6 | 7465 |
| 7 | 13539 |
| 8 | 22737 |
| 9 | 35983 |
| 10 | 54321 |
| 11 | 78915 |
| 12 | 111049 |
| 13 | 152127 |
| 14 | 203673 |
| 15 | 267331 |
| 16 | 344865 |
| 17 | 438159 |
| 18 | 549217 |
| 19 | 680163 |
| 20 | 833241 |
| 21 | 1010815 |
| 22 | 1215369 |
| 23 | 1449507 |
| 24 | 1715953 |
| 25 | 2017551 |
| 26 | 2357265 |
| 27 | 2738179 |
| 28 | 3163497 |
| 29 | 3636543 |