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 | 20 |
| 2 | 50 |
| 3 | 125 |
| 4 | 295 |
| 5 | 711 |
| 6 | 1730 |
| 7 | 4175 |
| 8 | 10077 |
| 9 | 24377 |
| 10 | 58928 |
| 11 | 142396 |
| 12 | 344201 |
| 13 | 832011 |
| 14 | 2010980 |
| 15 | 4860690 |
| 16 | 11748840 |
| 17 | 28397936 |
| 18 | 68640170 |
| 19 | 165909570 |
| 20 | 401018224 |
| 21 | 969296175 |
| 22 | 2342874854 |
| 23 | 5662936565 |
| 24 | 13687818660 |
| 25 | 33084669767 |
| 26 | 79968578621 |