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 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 7 |
| 6 | 31 |
| 7 | 66 |
| 8 | 302 |
| 9 | 715 |
| 10 | 3313 |
| 11 | 8398 |
| 12 | 39095 |
| 13 | 104006 |
| 14 | 484706 |
| 15 | 1337220 |
| 16 | 6227730 |
| 17 | 17678835 |
| 18 | 82204045 |
| 19 | 238819350 |
| 20 | 1108202513 |
| 21 | 3282060210 |
| 22 | 15195242478 |
| 23 | 45741281820 |
| 24 | 211271435479 |
| 25 | 644952073662 |
| 26 | 2971835602526 |
| 27 | 9183676536076 |
| 28 | 42217430993002 |
| 29 | 131873975875180 |
| 30 | 604834233372884 |