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 | 5 |
| 2 | 11 |
| 3 | 71 |
| 4 | 2591 |
| 5 | 208391 |
| 6 | 16692551 |
| 7 | 48502931 |
| 8 | 92012201 |
| 9 | 249206231 |
| 10 | 419445251 |
| 11 | 496978301 |
| 12 | 1329067391 |
| 13 | 1837151681 |
| 14 | 2277479051 |
| 15 | 2647600061 |
| 16 | 4733566391 |
| 17 | 6435087011 |
| 18 | 10327948751 |
| 19 | 14089345691 |
| 20 | 14923624031 |
| 21 | 22415286251 |
| 22 | 27508270301 |
| 23 | 39662281331 |
| 24 | 59013882071 |
| 25 | 70353395351 |