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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 24 |
| 4 | 88 |
| 5 | 400 |
| 6 | 2212 |
| 7 | 14500 |
| 8 | 110116 |
| 9 | 951076 |
| 10 | 9205156 |
| 11 | 98646436 |
| 12 | 1159016356 |
| 13 | 14808626596 |
| 14 | 204358994596 |
| 15 | 3028436306596 |
| 16 | 47955883346596 |
| 17 | 807990334802596 |
| 18 | 14430691329362596 |
| 19 | 272302801683794596 |
| 20 | 5412861968581970596 |