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 | 203 |
| 2 | 19232 |
| 3 | 904580 |
| 4 | 24537905 |
| 5 | 425677958 |
| 6 | 5064948309 |
| 7 | 43418499491 |
| 8 | 277921468720 |
| 9 | 1364366313210 |
| 10 | 5242437628968 |
| 11 | 16014094403124 |
| 12 | 39357448344781 |
| 13 | 78528595223300 |
| 14 | 128048008057615 |
| 15 | 171403741608326 |
| 16 | 188847475249322 |
| 17 | 171403741608326 |
| 18 | 128048008057615 |
| 19 | 78528595223300 |