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 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 54 |
| 6 | 122 |
| 7 | 278 |
| 8 | 634 |
| 9 | 1438 |
| 10 | 3274 |
| 11 | 7451 |
| 12 | 16943 |
| 13 | 38547 |
| 14 | 87691 |
| 15 | 199477 |
| 16 | 453789 |
| 17 | 1032300 |
| 18 | 2348324 |
| 19 | 5342108 |
| 20 | 12152500 |
| 21 | 27645148 |
| 22 | 62888676 |
| 23 | 143062485 |
| 24 | 325446157 |
| 25 | 740342261 |
| 26 | 1684169937 |
| 27 | 3831239423 |
| 28 | 8715507347 |
| 29 | 19826499874 |
| 30 | 45102377086 |