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 | 17 |
| 3 | 289 |
| 4 | 4913 |
| 5 | 83521 |
| 6 | 1419857 |
| 7 | 6029713 |
| 8 | 12027313 |
| 9 | 24137569 |
| 10 | 85525793 |
| 11 | 102505121 |
| 12 | 204464321 |
| 13 | 410338673 |
| 14 | 1453938481 |
| 15 | 1742587057 |
| 16 | 3475893457 |
| 17 | 6975757441 |
| 18 | 24716954177 |
| 19 | 29623979969 |
| 20 | 59090188769 |
| 21 | 111612202577 |
| 22 | 118587876497 |
| 23 | 420188221009 |
| 24 | 500540685121 |
| 25 | 503607659473 |