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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 23 |
| 5 | 66 |
| 6 | 210 |
| 7 | 731 |
| 8 | 2744 |
| 9 | 10959 |
| 10 | 46058 |
| 11 | 202028 |
| 12 | 919386 |
| 13 | 4321837 |
| 14 | 20916763 |
| 15 | 103958935 |
| 16 | 529512396 |
| 17 | 2759340117 |
| 18 | 14690668955 |
| 19 | 79813438230 |
| 20 | 442057104246 |
| 21 | 2493917931493 |
| 22 | 14320972817368 |
| 23 | 83652035642564 |
| 24 | 496769855224824 |