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 | 9 |
| 2 | 26 |
| 3 | 75 |
| 4 | 217 |
| 5 | 629 |
| 6 | 1826 |
| 7 | 5307 |
| 8 | 15438 |
| 9 | 44941 |
| 10 | 130900 |
| 11 | 381444 |
| 12 | 1111926 |
| 13 | 3242224 |
| 14 | 9455987 |
| 15 | 27583372 |
| 16 | 80472698 |
| 17 | 234799873 |
| 18 | 685149328 |
| 19 | 1999414181 |
| 20 | 5835044495 |
| 21 | 17029601028 |
| 22 | 49702671494 |
| 23 | 145066398937 |
| 24 | 423412132499 |
| 25 | 1235854038791 |
| 26 | 3607255734629 |
| 27 | 10529101874491 |