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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 25 |
| 5 | 121 |
| 6 | 361 |
| 7 | 841 |
| 8 | 21841 |
| 9 | 184465 |
| 10 | 912241 |
| 11 | 3334321 |
| 12 | 89824681 |
| 13 | 1063799881 |
| 14 | 7325422105 |
| 15 | 36454050361 |
| 16 | 1017339566881 |
| 17 | 15314809967521 |
| 18 | 134865698721121 |
| 19 | 848781820990945 |
| 20 | 24508030788375481 |
| 21 | 443521231499750041 |
| 22 | 4748434334677932361 |
| 23 | 36119410438503259561 |