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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 23 |
| 5 | 59 |
| 6 | 154 |
| 7 | 407 |
| 8 | 1088 |
| 9 | 2935 |
| 10 | 7980 |
| 11 | 21843 |
| 12 | 60139 |
| 13 | 166425 |
| 14 | 462638 |
| 15 | 1291245 |
| 16 | 3616923 |
| 17 | 10164335 |
| 18 | 28648092 |
| 19 | 80960915 |
| 20 | 229360649 |
| 21 | 651237509 |
| 22 | 1852936294 |
| 23 | 5282196109 |
| 24 | 15084862158 |
| 25 | 43150636493 |
| 26 | 123624304356 |
| 27 | 354689105733 |