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 | 7 |
| 4 | 9 |
| 5 | 31 |
| 6 | 223 |
| 7 | 442 |
| 8 | 1529 |
| 9 | 6559 |
| 10 | 66111 |
| 11 | 159952 |
| 12 | 742503 |
| 13 | 3047656 |
| 14 | 19094286 |
| 15 | 245173117 |
| 16 | 761328969 |
| 17 | 3935539271 |
| 18 | 20213664703 |
| 19 | 117323673136 |
| 20 | 897132508439 |
| 21 | 15791065424134 |
| 22 | 56649181720176 |
| 23 | 353387529508691 |
| 24 | 1955231849465423 |