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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 34 |
| 6 | 131 |
| 7 | 484 |
| 8 | 1812 |
| 9 | 6756 |
| 10 | 25221 |
| 11 | 94118 |
| 12 | 351262 |
| 13 | 1310918 |
| 14 | 4892423 |
| 15 | 18258760 |
| 16 | 68142632 |
| 17 | 254311752 |
| 18 | 949104393 |
| 19 | 3542105802 |
| 20 | 13219318834 |
| 21 | 49335169514 |
| 22 | 184121359243 |
| 23 | 687150267436 |
| 24 | 2564479710524 |
| 25 | 9570768574636 |
| 26 | 35718594588045 |