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 | 13 |
| 2 | 81 |
| 3 | 345 |
| 4 | 1155 |
| 5 | 3267 |
| 6 | 8151 |
| 7 | 18447 |
| 8 | 38610 |
| 9 | 75790 |
| 10 | 140998 |
| 11 | 250614 |
| 12 | 428298 |
| 13 | 707370 |
| 14 | 1133730 |
| 15 | 1769394 |
| 16 | 2696727 |
| 17 | 4023459 |
| 18 | 5888575 |
| 19 | 8469175 |
| 20 | 11988405 |
| 21 | 16724565 |
| 22 | 23021505 |
| 23 | 31300425 |