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 | 4 |
| 3 | 15 |
| 4 | 26 |
| 5 | 81 |
| 6 | 158 |
| 7 | 417 |
| 8 | 990 |
| 9 | 2491 |
| 10 | 6402 |
| 11 | 17363 |
| 12 | 44450 |
| 13 | 119773 |
| 14 | 326786 |
| 15 | 659957 |
| 16 | 1845500 |
| 17 | 4779649 |
| 18 | 9921002 |
| 19 | 27575339 |
| 20 | 67458614 |
| 21 | 187615521 |
| 22 | 515594444 |
| 23 | 1433794185 |
| 24 | 3989181038 |
| 25 | 11160791967 |
| 26 | 31287537756 |