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 | 1 |
| 1 | 5 |
| 2 | 23 |
| 3 | 107 |
| 4 | 497 |
| 5 | 2309 |
| 6 | 10727 |
| 7 | 49835 |
| 8 | 231521 |
| 9 | 1075589 |
| 10 | 4996919 |
| 11 | 23214443 |
| 12 | 107848529 |
| 13 | 501037445 |
| 14 | 2327695367 |
| 15 | 10813893803 |
| 16 | 50238661313 |
| 17 | 233396326661 |
| 18 | 1084301290583 |
| 19 | 5037394142315 |
| 20 | 23402480441009 |
| 21 | 108722104190981 |
| 22 | 505095858086951 |
| 23 | 2346549744920747 |