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 | 5 |
| 3 | 13 |
| 4 | 45 |
| 5 | 109 |
| 6 | 365 |
| 7 | 877 |
| 8 | 2925 |
| 9 | 7021 |
| 10 | 23405 |
| 11 | 56173 |
| 12 | 187245 |
| 13 | 449389 |
| 14 | 1497965 |
| 15 | 3595117 |
| 16 | 11983725 |
| 17 | 28760941 |
| 18 | 95869805 |
| 19 | 230087533 |
| 20 | 766958445 |
| 21 | 1840700269 |
| 22 | 6135667565 |
| 23 | 14725602157 |
| 24 | 49085340525 |
| 25 | 117804817261 |
| 26 | 392682724205 |