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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 77 |
| 6 | 272 |
| 7 | 954 |
| 8 | 3390 |
| 9 | 20942 |
| 10 | 81886 |
| 11 | 313216 |
| 12 | 1200192 |
| 13 | 7744531 |
| 14 | 31604104 |
| 15 | 125795060 |
| 16 | 500225166 |
| 17 | 3302458490 |
| 18 | 13797942732 |
| 19 | 56190743623 |
| 20 | 228422293810 |
| 21 | 1529418005565 |
| 22 | 6486104136768 |
| 23 | 26809045163856 |
| 24 | 110586420610480 |
| 25 | 747542548312112 |
| 26 | 3203080302079898 |