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 | 16 |
| 2 | 101 |
| 3 | 465 |
| 4 | 1928 |
| 5 | 7812 |
| 6 | 31710 |
| 7 | 129402 |
| 8 | 529846 |
| 9 | 2172346 |
| 10 | 8908986 |
| 11 | 36534670 |
| 12 | 149811438 |
| 13 | 614276002 |
| 14 | 2518688490 |
| 15 | 10327233902 |
| 16 | 42344211246 |
| 17 | 173621959826 |
| 18 | 711894378346 |
| 19 | 2918949452350 |
| 20 | 11968441441998 |
| 21 | 49073678703842 |