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 | 5881 |
| 8 | 62161 |
| 9 | 365905 |
| 10 | 5145841 |
| 11 | 84831121 |
| 12 | 812318761 |
| 13 | 11450816521 |
| 14 | 243450591385 |
| 15 | 3371056121161 |
| 16 | 51784222133281 |
| 17 | 1275605799044641 |
| 18 | 23531635543402081 |
| 19 | 410559590525890465 |
| 20 | 11089633716053137081 |
| 21 | 256375957896260034841 |
| 22 | 5161258224477109736521 |