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 | 13 |
| 2 | 169 |
| 3 | 493 |
| 4 | 1360 |
| 5 | 4387 |
| 6 | 14225 |
| 7 | 49586 |
| 8 | 175747 |
| 9 | 645245 |
| 10 | 2403872 |
| 11 | 9120677 |
| 12 | 34960907 |
| 13 | 135357992 |
| 14 | 527526895 |
| 15 | 2067755087 |
| 16 | 8138519992 |
| 17 | 32142126101 |
| 18 | 127268868773 |
| 19 | 504981199930 |
| 20 | 2006919956813 |
| 21 | 7986355654043 |
| 22 | 31813478437106 |
| 23 | 126832238503405 |