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 | 18 |
| 3 | 307 |
| 4 | 5220 |
| 5 | 88741 |
| 6 | 1508598 |
| 7 | 25646167 |
| 8 | 435984840 |
| 9 | 7411742281 |
| 10 | 125999618778 |
| 11 | 2141993519227 |
| 12 | 36413889826860 |
| 13 | 619036127056621 |
| 14 | 10523614159962558 |
| 15 | 178901440719363487 |
| 16 | 3041324492229179280 |
| 17 | 51702516367896047761 |