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 | 1 |
| 3 | 4 |
| 4 | 1 |
| 5 | 19 |
| 6 | 53 |
| 7 | 58 |
| 8 | 97 |
| 9 | 181 |
| 10 | 4244 |
| 11 | 2122 |
| 12 | 31126 |
| 13 | 16451 |
| 14 | 297392 |
| 15 | 2444006 |
| 16 | 622249 |
| 17 | 2909047 |
| 18 | 216182072 |
| 19 | 62801719 |
| 20 | 769709491 |
| 21 | 32522441312 |
| 22 | 37859955467 |
| 23 | 129549407177 |
| 24 | 286721160343 |
| 25 | 101419856449 |
| 26 | 107709289064864 |
| 27 | 72441253480727 |
| 28 | 56099073382147 |
| 29 | 5249126879235893 |