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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 17 |
| 10 | 1 |
| 11 | 31 |
| 12 | 31 |
| 13 | 691 |
| 14 | 42151 |
| 15 | 29713 |
| 16 | 505121 |
| 17 | 642332179 |
| 18 | 692319119 |
| 19 | 8003636403977 |
| 20 | 248112728523287 |
| 21 | 593468652605200909 |
| 22 | 50904295073459007001 |
| 23 | 1015740532498234470066371 |
| 24 | 701876707956280018815862361 |