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 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 41 |
| 5 | 136 |
| 6 | 523 |
| 7 | 2330 |
| 8 | 11857 |
| 9 | 67912 |
| 10 | 432291 |
| 11 | 3027166 |
| 12 | 23125673 |
| 13 | 191389108 |
| 14 | 1705788659 |
| 15 | 16289080922 |
| 16 | 165919213089 |
| 17 | 1795666675824 |
| 18 | 20576824369027 |
| 19 | 248892651678198 |
| 20 | 3168999664907705 |
| 21 | 42366404751871660 |
| 22 | 593368400878431795 |
| 23 | 8688251294851280594 |