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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 111 |
| 4 | 291 |
| 5 | 651 |
| 6 | 4251 |
| 7 | 165751 |
| 8 | 64101 |
| 9 | 78501 |
| 10 | 222501 |
| 11 | 62501601 |
| 12 | 62516001 |
| 13 | 62660001 |
| 14 | 2441447211 |
| 15 | 3922328562757 |
| 16 | 390625025601 |
| 17 | 2482366251 |
| 18 | 2851006251 |
| 19 | 62500000160001 |
| 20 | 390881000001 |
| 21 | 412041406251 |
| 22 | 15259444422501 |
| 23 | 40002500000001 |