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 | 21 |
| 2 | 441 |
| 3 | 2499 |
| 4 | 8799 |
| 5 | 23856 |
| 6 | 54684 |
| 7 | 111426 |
| 8 | 208026 |
| 9 | 362943 |
| 10 | 599907 |
| 11 | 948717 |
| 12 | 1446081 |
| 13 | 2136498 |
| 14 | 3073182 |
| 15 | 4319028 |
| 16 | 5947620 |
| 17 | 8044281 |
| 18 | 10707165 |
| 19 | 14048391 |
| 20 | 18195219 |
| 21 | 23291268 |
| 22 | 29497776 |
| 23 | 36994902 |
| 24 | 45983070 |
| 25 | 56684355 |
| 26 | 69343911 |
| 27 | 84231441 |