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 | 7 |
| 1 | 37 |
| 2 | 215 |
| 3 | 1253 |
| 4 | 7303 |
| 5 | 42565 |
| 6 | 248087 |
| 7 | 1445957 |
| 8 | 8427655 |
| 9 | 49119973 |
| 10 | 286292183 |
| 11 | 1668633125 |
| 12 | 9725506567 |
| 13 | 56684406277 |
| 14 | 330380931095 |
| 15 | 1925601180293 |
| 16 | 11223226150663 |
| 17 | 65413755723685 |
| 18 | 381259308191447 |
| 19 | 2222142093424997 |
| 20 | 12951593252358535 |
| 21 | 75487417420726213 |