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 | 2 |
| 4 | 5 |
| 5 | 61 |
| 6 | 16 |
| 7 | 272 |
| 8 | 5831 |
| 9 | 6397 |
| 10 | 12505 |
| 11 | 297353 |
| 12 | 5672072 |
| 13 | 65286322 |
| 14 | 189063991 |
| 15 | 2137573091 |
| 16 | 54121519391 |
| 17 | 679243568902 |
| 18 | 1445769784042 |
| 19 | 23821158888092 |
| 20 | 525732881173073 |
| 21 | 6904213508941594 |
| 22 | 10973139347884396 |
| 23 | 2532586056883245101 |
| 24 | 50968075536143541551 |