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 | 19 |
| 3 | 64 |
| 4 | 185 |
| 5 | 542 |
| 6 | 1511 |
| 7 | 4144 |
| 8 | 11329 |
| 9 | 29894 |
| 10 | 80731 |
| 11 | 207696 |
| 12 | 556217 |
| 13 | 1405566 |
| 14 | 3741263 |
| 15 | 9328928 |
| 16 | 24716353 |
| 17 | 60998086 |
| 18 | 161022115 |
| 19 | 394136864 |
| 20 | 1037382905 |
| 21 | 2522256670 |
| 22 | 6622609463 |
| 23 | 16012527312 |
| 24 | 41958312193 |
| 25 | 100973218566 |