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 | 3 |
| 3 | 7 |
| 4 | 18 |
| 5 | 46 |
| 6 | 124 |
| 7 | 337 |
| 8 | 935 |
| 9 | 2605 |
| 10 | 7328 |
| 11 | 20684 |
| 12 | 58670 |
| 13 | 166863 |
| 14 | 476032 |
| 15 | 1360955 |
| 16 | 3899324 |
| 17 | 11191494 |
| 18 | 32173714 |
| 19 | 92625281 |
| 20 | 267010344 |
| 21 | 770610783 |
| 22 | 2226438062 |
| 23 | 6438902174 |
| 24 | 18638275524 |
| 25 | 53995855636 |
| 26 | 156548609636 |
| 27 | 454200201824 |