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 | 64 |
| 4 | 1250 |
| 5 | 3888 |
| 6 | 235298 |
| 7 | 2097152 |
| 8 | 86093442 |
| 9 | 250000000 |
| 10 | 51874849202 |
| 11 | 743008370688 |
| 12 | 46596170244962 |
| 13 | 396857386627072 |
| 14 | 58385852050781250 |
| 15 | 1152921504606846976 |
| 16 | 97322383751333736962 |
| 17 | 273238944967337066496 |
| 18 | 208254700595822483065682 |
| 19 | 5242880000000000000000000 |
| 20 | 556436858893903097274392802 |