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 | 217 |
| 2 | 22597 |
| 3 | 680945 |
| 4 | 9490490 |
| 5 | 80581316 |
| 6 | 486166212 |
| 7 | 2286928302 |
| 8 | 8905291815 |
| 9 | 29900133355 |
| 10 | 89103652231 |
| 11 | 240740576407 |
| 12 | 599256323432 |
| 13 | 1391503809710 |
| 14 | 3043867911470 |
| 15 | 6322051689996 |
| 16 | 12547838923677 |
| 17 | 23925432720237 |
| 18 | 44020219452505 |
| 19 | 78445310367085 |
| 20 | 135826279312486 |