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 | 0 |
| 2 | 6 |
| 3 | 30 |
| 4 | 36 |
| 5 | 3130 |
| 6 | 528 |
| 7 | 823550 |
| 8 | 200 |
| 9 | 1467 |
| 10 | 200240 |
| 11 | 285311670622 |
| 12 | 5820 |
| 13 | 302875106592266 |
| 14 | 210827456 |
| 15 | 1525560 |
| 16 | 1040 |
| 17 | 827240261886336764194 |
| 18 | 24390 |
| 19 | 1978419655660313589123998 |
| 20 | 9601700 |
| 21 | 3602195688 |
| 22 | 1168636602823712 |
| 23 | 20880467999847912034355032910590 |
| 24 | 58896 |
| 25 | 19531275 |