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) |
|---|---|
| 3 | 16 |
| 4 | 70 |
| 5 | 292 |
| 6 | 1197 |
| 7 | 4864 |
| 8 | 19656 |
| 9 | 79124 |
| 10 | 317592 |
| 11 | 1271976 |
| 12 | 5085730 |
| 13 | 20307396 |
| 14 | 81003583 |
| 15 | 322847552 |
| 16 | 1285900570 |
| 17 | 5119076236 |
| 18 | 20370229878 |
| 19 | 81032093192 |
| 20 | 322258628220 |
| 21 | 1281334227276 |
| 22 | 5093898416278 |
| 23 | 20248096412336 |
| 24 | 80478051058480 |