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 | 2 |
| 2 | 21 |
| 3 | 134 |
| 4 | 751 |
| 5 | 2628 |
| 6 | 11381 |
| 7 | 63898 |
| 8 | 318941 |
| 9 | 1851114 |
| 10 | 11138635 |
| 11 | 59638094 |
| 12 | 413291157 |
| 13 | 2550007678 |
| 14 | 20721795665 |
| 15 | 132517178106 |