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 | 1 |
| 2 | 4 |
| 3 | 25 |
| 4 | 41 |
| 5 | 260 |
| 6 | 1649 |
| 7 | 2705 |
| 8 | 17156 |
| 9 | 108809 |
| 10 | 178489 |
| 11 | 1132036 |
| 12 | 7179745 |
| 13 | 11777569 |
| 14 | 74697220 |
| 15 | 473754361 |
| 16 | 777141065 |
| 17 | 4928884484 |
| 18 | 31260608081 |
| 19 | 51279532721 |
| 20 | 325231678724 |
| 21 | 2062726378985 |
| 22 | 3383672018521 |
| 23 | 21460361911300 |
| 24 | 136108680404929 |
| 25 | 223271073689665 |