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 | 3 |
| 4 | 5 |
| 5 | 23 |
| 6 | 57 |
| 7 | 355 |
| 8 | 1165 |
| 9 | 9135 |
| 10 | 37313 |
| 11 | 352667 |
| 12 | 1723605 |
| 13 | 19063207 |
| 14 | 108468169 |
| 15 | 1374019539 |
| 16 | 8920711325 |
| 17 | 127336119839 |
| 18 | 928899673425 |
| 19 | 14751357906571 |
| 20 | 119445766884325 |
| 21 | 2088674728868631 |
| 22 | 18588486479073881 |
| 23 | 354892573941671363 |
| 24 | 3443175067395538605 |