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 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 12 |
| 6 | 26 |
| 7 | 57 |
| 8 | 130 |
| 9 | 297 |
| 10 | 694 |
| 11 | 1622 |
| 12 | 3810 |
| 13 | 8966 |
| 14 | 21092 |
| 15 | 49732 |
| 16 | 116952 |
| 17 | 275695 |
| 18 | 647788 |
| 19 | 1525610 |
| 20 | 3581170 |
| 21 | 8424478 |
| 22 | 19757082 |
| 23 | 46425561 |