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 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 57 |
| 5 | 68 |
| 6 | 805 |
| 7 | 873 |
| 8 | 1678 |
| 9 | 9263 |
| 10 | 10941 |
| 11 | 293729 |
| 12 | 598399 |
| 13 | 6876118 |
| 14 | 7474517 |
| 15 | 14350635 |
| 16 | 36175787 |
| 17 | 50526422 |
| 18 | 137228631 |
| 19 | 13224474998 |
| 20 | 13361703629 |
| 21 | 26586178627 |
| 22 | 39947882256 |
| 23 | 66534060883 |
| 24 | 106481943139 |
| 25 | 40849118283120 |
| 26 | 245201191641859 |
| 27 | 286050309924979 |