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 | 19 |
| 2 | 253 |
| 3 | 3071 |
| 4 | 32633 |
| 5 | 313259 |
| 6 | 2787125 |
| 7 | 23120727 |
| 8 | 179773681 |
| 9 | 1318315075 |
| 10 | 9183188589 |
| 11 | 61157195951 |
| 12 | 390820296297 |
| 13 | 2405500230619 |
| 14 | 14298590156965 |
| 15 | 82219631208967 |
| 16 | 458093162029537 |
| 17 | 2477433774277747 |
| 18 | 13028767115904989 |