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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 1 |
| 12 | 3 |
| 13 | 8 |
| 14 | 25 |
| 15 | 88 |
| 16 | 377 |
| 17 | 2026 |
| 18 | 13349 |
| 19 | 104593 |
| 20 | 930571 |
| 21 | 9124627 |
| 22 | 96699740 |
| 23 | 1095467916 |
| 24 | 13175254799 |
| 25 | 167460501260 |
| 26 | 2241576473025 |
| 27 | 31510509517563 |
| 28 | 464047467911837 |
| 29 | 7143984462730072 |
| 30 | 114749034352969037 |
| 31 | 1919656978492976231 |