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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 29 |
| 5 | 101 |
| 6 | 379 |
| 7 | 1525 |
| 8 | 6549 |
| 9 | 29889 |
| 10 | 144419 |
| 11 | 736241 |
| 12 | 3947725 |
| 13 | 22201549 |
| 14 | 130624587 |
| 15 | 802180701 |
| 16 | 5131183301 |
| 17 | 34121977865 |
| 18 | 235486915507 |
| 19 | 1683925343929 |
| 20 | 12458499203901 |
| 21 | 95237603403381 |
| 22 | 751291094637083 |
| 23 | 6108883628141189 |
| 24 | 51144808472958709 |
| 25 | 440444879385258001 |