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 | 12563307224 |
| 3 | 15897851550 |
| 4 | 30412355999 |
| 5 | 37706988600 |
| 6 | 52576459775 |
| 7 | 67673545631 |
| 8 | 118533901904 |
| 9 | 244316235000 |
| 10 | 297265003100 |
| 11 | 332110595000 |
| 12 | 340800265728 |
| 13 | 349358409503 |
| 14 | 375624917760 |
| 15 | 378624889440 |
| 16 | 416375389115 |
| 17 | 450026519903 |
| 18 | 561162864248 |
| 19 | 596004199840 |
| 20 | 728643460544 |