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 | 0 |
| 1 | 30 |
| 2 | 2970 |
| 3 | 291060 |
| 4 | 28520940 |
| 5 | 2794761090 |
| 6 | 273858065910 |
| 7 | 26835295698120 |
| 8 | 2629585120349880 |
| 9 | 257672506498590150 |
| 10 | 25249276051741484850 |
| 11 | 2474171380564166925180 |
| 12 | 242443546019236617182820 |
| 13 | 23756993338504624316991210 |
| 14 | 2327942903627433946447955790 |
| 15 | 228114647562150022127582676240 |