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 | 25 |
| 2 | 823 |
| 3 | 34459 |
| 4 | 1663267 |
| 5 | 85847347 |
| 6 | 4598058505 |
| 7 | 252738855901 |
| 8 | 14170006731643 |
| 9 | 806810379495379 |
| 10 | 46503528950782309 |
| 11 | 2707097765891635585 |
| 12 | 158884136607368717797 |
| 13 | 9389663462839346537221 |
| 14 | 558176792747732603265463 |
| 15 | 33349982885530909490561203 |