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 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 53 |
| 5 | 148 |
| 6 | 412 |
| 7 | 1143 |
| 8 | 3161 |
| 9 | 8717 |
| 10 | 23977 |
| 11 | 65798 |
| 12 | 180182 |
| 13 | 492459 |
| 14 | 1343563 |
| 15 | 3659623 |
| 16 | 9953117 |
| 17 | 27031768 |
| 18 | 73320496 |
| 19 | 198632607 |
| 20 | 537507677 |
| 21 | 1452978593 |
| 22 | 3923762257 |
| 23 | 10586222474 |
| 24 | 28536313898 |
| 25 | 76859031123 |