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 | 4 |
| 2 | 28 |
| 3 | 214 |
| 4 | 1803 |
| 5 | 15830 |
| 6 | 142844 |
| 7 | 1313047 |
| 8 | 12220699 |
| 9 | 114790260 |
| 10 | 1085885280 |
| 11 | 10330026070 |
| 12 | 98719755796 |
| 13 | 947012920362 |
| 14 | 9113815047794 |
| 15 | 87950106960771 |
| 16 | 850754904051968 |