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 | 3 |
| 2 | 18 |
| 3 | 135 |
| 4 | 1134 |
| 5 | 10206 |
| 6 | 96228 |
| 7 | 938223 |
| 8 | 9382230 |
| 9 | 95698746 |
| 10 | 991787004 |
| 11 | 10413763542 |
| 12 | 110546105292 |
| 13 | 1184422556700 |
| 14 | 12791763612360 |
| 15 | 139110429284415 |
| 16 | 1522031755700070 |
| 17 | 16742349312700770 |
| 18 | 185047018719324300 |
| 19 | 2054021907784499730 |