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 | 8 |
| 3 | 22 |
| 4 | 65 |
| 5 | 203 |
| 6 | 647 |
| 7 | 2053 |
| 8 | 6423 |
| 9 | 19811 |
| 10 | 60490 |
| 11 | 183750 |
| 12 | 557551 |
| 13 | 1693921 |
| 14 | 5157224 |
| 15 | 15731043 |
| 16 | 48041589 |
| 17 | 146785994 |
| 18 | 448475954 |
| 19 | 1369853581 |
| 20 | 4182850121 |
| 21 | 12769287055 |
| 22 | 38976737437 |
| 23 | 118967979141 |
| 24 | 363132913719 |
| 25 | 1108463577238 |
| 26 | 3383732698880 |
| 27 | 10329587789993 |