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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 33 |
| 5 | 68 |
| 6 | 169 |
| 7 | 406 |
| 8 | 981 |
| 9 | 1387 |
| 10 | 25947 |
| 11 | 53281 |
| 12 | 132509 |
| 13 | 1510880 |
| 14 | 1643389 |
| 15 | 3154269 |
| 16 | 7951927 |
| 17 | 34961977 |
| 18 | 42913904 |
| 19 | 721584441 |
| 20 | 2207667227 |
| 21 | 5136918895 |
| 22 | 22755342807 |
| 23 | 482999117842 |
| 24 | 988753578491 |
| 25 | 400928198406697 |
| 26 | 802845150391885 |