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 | 6 |
| 2 | 16 |
| 3 | 52 |
| 4 | 156 |
| 5 | 476 |
| 6 | 1436 |
| 7 | 4332 |
| 8 | 13036 |
| 9 | 39196 |
| 10 | 117756 |
| 11 | 353612 |
| 12 | 1061516 |
| 13 | 3185916 |
| 14 | 9560476 |
| 15 | 28686892 |
| 16 | 86071596 |
| 17 | 258236636 |
| 18 | 774753596 |
| 19 | 2324348172 |
| 20 | 6973219276 |
| 21 | 20920007356 |
| 22 | 62760721116 |
| 23 | 188283561452 |
| 24 | 564853480556 |