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 | 4 |
| 4 | 10 |
| 5 | 26 |
| 6 | 76 |
| 7 | 232 |
| 8 | 763 |
| 9 | 2611 |
| 10 | 9415 |
| 11 | 35135 |
| 12 | 136335 |
| 13 | 544623 |
| 14 | 2242618 |
| 15 | 9463508 |
| 16 | 40917803 |
| 17 | 180620411 |
| 18 | 813405580 |
| 19 | 3728248990 |
| 20 | 17377551032 |
| 21 | 82232982872 |
| 22 | 394742985974 |
| 23 | 1919885633178 |
| 24 | 9453682648281 |
| 25 | 47086636037601 |
| 26 | 237071351741426 |
| 27 | 1205689994416252 |