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 | 11 |
| 3 | 41 |
| 4 | 154 |
| 5 | 581 |
| 6 | 2197 |
| 7 | 8317 |
| 8 | 31501 |
| 9 | 119338 |
| 10 | 452141 |
| 11 | 1713111 |
| 12 | 6490879 |
| 13 | 24593701 |
| 14 | 93184802 |
| 15 | 353074657 |
| 16 | 1337790401 |
| 17 | 5068852073 |
| 18 | 19205744921 |
| 19 | 72770053106 |
| 20 | 275723780329 |
| 21 | 1044710007771 |
| 22 | 3958378188707 |
| 23 | 14998188734897 |