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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 1 |
| 13 | 21 |
| 14 | 21 |
| 15 | 266 |
| 16 | 266 |
| 17 | 2646 |
| 18 | 2646 |
| 19 | 22827 |
| 20 | 22827 |
| 21 | 179487 |
| 22 | 179486 |
| 23 | 1323652 |
| 24 | 1323651 |
| 25 | 9321312 |
| 26 | 9321291 |
| 27 | 63436373 |
| 28 | 63436352 |
| 29 | 420693273 |
| 30 | 420693007 |
| 31 | 2734926558 |