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 | 244 |
| 3 | 8020 |
| 4 | 108020 |
| 5 | 867395 |
| 6 | 4951496 |
| 7 | 22161864 |
| 8 | 82628040 |
| 9 | 267156165 |
| 10 | 770440540 |
| 11 | 2022773116 |
| 12 | 4909947484 |
| 13 | 11150268935 |
| 14 | 23913084560 |
| 15 | 48796284560 |
| 16 | 95322158736 |
| 17 | 179163294729 |
| 18 | 325374464580 |
| 19 | 572984364580 |
| 20 | 981394464580 |
| 21 | 1639143014731 |
| 22 | 2675722491224 |
| 23 | 4277290592600 |