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 | 3 |
| 3 | 13 |
| 4 | 63 |
| 5 | 326 |
| 6 | 1769 |
| 7 | 9964 |
| 8 | 57843 |
| 9 | 344203 |
| 10 | 2090470 |
| 11 | 12912988 |
| 12 | 80899801 |
| 13 | 512896540 |
| 14 | 3284651548 |
| 15 | 21217493460 |
| 16 | 138080484819 |
| 17 | 904454380446 |
| 18 | 5958186674879 |
| 19 | 39448465279220 |
| 20 | 262359379484522 |
| 21 | 1751912981641794 |
| 22 | 11741044418866476 |