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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 13 |
| 5 | 40 |
| 6 | 49 |
| 7 | 65 |
| 8 | 399 |
| 9 | 2076 |
| 10 | 11626 |
| 11 | 12156 |
| 12 | 12190 |
| 13 | 16992 |
| 14 | 87983 |
| 15 | 717895 |
| 16 | 2186175 |
| 17 | 4327480 |
| 18 | 7928565 |
| 19 | 8130547 |
| 20 | 12139891 |
| 21 | 54517279 |
| 22 | 67728780 |
| 23 | 264656137 |
| 24 | 410041022 |
| 25 | 2970688427 |
| 26 | 13126642049 |
| 27 | 19585729892 |
| 28 | 71713995073 |