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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 22 |
| 6 | 52 |
| 7 | 283 |
| 8 | 855 |
| 9 | 5451 |
| 10 | 19921 |
| 11 | 144074 |
| 12 | 614866 |
| 13 | 4941987 |
| 14 | 24040451 |
| 15 | 211648665 |
| 16 | 1152972925 |
| 17 | 10998989896 |
| 18 | 66200911138 |
| 19 | 678600959525 |
| 20 | 4465023867757 |
| 21 | 48850849177703 |
| 22 | 348383154017581 |
| 23 | 4045835816532096 |
| 24 | 31052765897026352 |
| 25 | 381022649523561501 |