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 | 5 |
| 2 | 21 |
| 3 | 28 |
| 4 | 74 |
| 5 | 197 |
| 6 | 544 |
| 7 | 1686 |
| 8 | 5252 |
| 9 | 16336 |
| 10 | 52895 |
| 11 | 174633 |
| 12 | 585706 |
| 13 | 2005396 |
| 14 | 6966921 |
| 15 | 24490114 |
| 16 | 86986183 |
| 17 | 311425171 |
| 18 | 1121853996 |
| 19 | 4061084204 |
| 20 | 14755768611 |
| 21 | 53766216246 |
| 22 | 196333300490 |
| 23 | 718099046548 |
| 24 | 2629697794146 |
| 25 | 9638889966861 |