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 | 20 |
| 3 | 22 |
| 4 | 40 |
| 5 | 68 |
| 6 | 248 |
| 7 | 7163 |
| 8 | 28663 |
| 9 | 50059 |
| 10 | 64574 |
| 11 | 638169 |
| 12 | 761733 |
| 13 | 2537764 |
| 14 | 2925739 |
| 15 | 3363073 |
| 16 | 4977902 |
| 17 | 5646039 |
| 18 | 57212854 |
| 19 | 159650555 |
| 20 | 219684539 |
| 21 | 453524713 |
| 22 | 459239955 |
| 23 | 2002180165 |
| 24 | 3234082460 |
| 25 | 14965375439 |
| 26 | 50298730245 |
| 27 | 89316768769 |
| 28 | 464076054936 |
| 29 | 520232391320 |