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 | 21 |
| 2 | 1069 |
| 3 | 25556 |
| 4 | 680302 |
| 5 | 17572772 |
| 6 | 451200772 |
| 7 | 11683058939 |
| 8 | 302190345444 |
| 9 | 7806399525348 |
| 10 | 201765495180944 |
| 11 | 5215449996133433 |
| 12 | 134798889001969231 |
| 13 | 3484039440752712049 |
| 14 | 90050899758881308054 |
| 15 | 2327507605574582278738 |