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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 13 |
| 6 | 35 |
| 7 | 93 |
| 8 | 227 |
| 9 | 499 |
| 10 | 1185 |
| 11 | 2823 |
| 12 | 6809 |
| 13 | 16640 |
| 14 | 40117 |
| 15 | 96797 |
| 16 | 232099 |
| 17 | 556269 |
| 18 | 1338482 |
| 19 | 3218538 |
| 20 | 7747725 |
| 21 | 18645571 |
| 22 | 44845905 |
| 23 | 107873385 |
| 24 | 259405282 |
| 25 | 623911219 |
| 26 | 1500766461 |
| 27 | 3609839279 |
| 28 | 8683275206 |
| 29 | 20886151010 |
| 30 | 50237661120 |
| 31 | 120837419260 |