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 | 99 |
| 3 | 5503 |
| 4 | 247759 |
| 5 | 10056959 |
| 6 | 384479935 |
| 7 | 14142942975 |
| 8 | 506544513343 |
| 9 | 17792504911231 |
| 10 | 615793150236223 |
| 11 | 21067276157958271 |
| 12 | 714097521397778495 |
| 13 | 24022705580163949439 |
| 14 | 803089367467759614015 |
| 15 | 26706726258154287563903 |