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 | 18 |
| 1 | 58 |
| 2 | 178 |
| 3 | 538 |
| 4 | 1618 |
| 5 | 4858 |
| 6 | 14578 |
| 7 | 43738 |
| 8 | 131218 |
| 9 | 393658 |
| 10 | 1180978 |
| 11 | 3542938 |
| 12 | 10628818 |
| 13 | 31886458 |
| 14 | 95659378 |
| 15 | 286978138 |
| 16 | 860934418 |
| 17 | 2582803258 |
| 18 | 7748409778 |
| 19 | 23245229338 |
| 20 | 69735688018 |
| 21 | 209207064058 |
| 22 | 627621192178 |
| 23 | 1882863576538 |