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 | 3 |
| 2 | 10 |
| 3 | 37 |
| 4 | 148 |
| 5 | 619 |
| 6 | 2638 |
| 7 | 11281 |
| 8 | 48040 |
| 9 | 203095 |
| 10 | 851746 |
| 11 | 3544765 |
| 12 | 14651452 |
| 13 | 60200131 |
| 14 | 246114934 |
| 15 | 1001997289 |
| 16 | 4065384784 |
| 17 | 16448074927 |
| 18 | 66394953802 |
| 19 | 267516917653 |
| 20 | 1076266398436 |
| 21 | 4324824038683 |
| 22 | 17362058273950 |
| 23 | 69646979806657 |
| 24 | 279215540418808 |