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 | 9 |
| 3 | 24 |
| 4 | 61 |
| 5 | 149 |
| 6 | 354 |
| 7 | 823 |
| 8 | 1881 |
| 9 | 4240 |
| 10 | 9449 |
| 11 | 20857 |
| 12 | 45666 |
| 13 | 99291 |
| 14 | 214589 |
| 15 | 461336 |
| 16 | 987221 |
| 17 | 2103917 |
| 18 | 4467394 |
| 19 | 9454895 |
| 20 | 19951601 |
| 21 | 41989408 |
| 22 | 88155409 |
| 23 | 184670769 |
| 24 | 386072386 |
| 25 | 805624179 |
| 26 | 1678235829 |
| 27 | 3490492968 |
| 28 | 7249103581 |
| 29 | 15034563845 |