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 | 9 |
| 2 | 98 |
| 3 | 1238 |
| 4 | 17688 |
| 5 | 280888 |
| 6 | 4894672 |
| 7 | 92676144 |
| 8 | 1891712384 |
| 9 | 41361536384 |
| 10 | 963532779264 |
| 11 | 23806296960256 |
| 12 | 621407739476992 |
| 13 | 17078348640463872 |
| 14 | 492724294444623872 |
| 15 | 14883442560920164352 |
| 16 | 469591293625846038528 |
| 17 | 15443081743064125505536 |
| 18 | 528340631093887891603456 |