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 | 12 |
| 5 | 33 |
| 6 | 103 |
| 7 | 333 |
| 8 | 1183 |
| 9 | 4442 |
| 10 | 17576 |
| 11 | 72810 |
| 12 | 314595 |
| 13 | 1410139 |
| 14 | 6541959 |
| 15 | 31322474 |
| 16 | 154468852 |
| 17 | 783240943 |
| 18 | 4077445511 |
| 19 | 21765312779 |
| 20 | 118999764062 |
| 21 | 665739100725 |
| 22 | 3807640240209 |
| 23 | 22246105114743 |
| 24 | 132672322938379 |
| 25 | 807126762251748 |