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 | 10 |
| 1 | 10 |
| 2 | 58 |
| 3 | 170 |
| 4 | 562 |
| 5 | 1962 |
| 6 | 6562 |
| 7 | 22202 |
| 8 | 75242 |
| 9 | 254330 |
| 10 | 860474 |
| 11 | 2911226 |
| 12 | 9848050 |
| 13 | 33316090 |
| 14 | 112707970 |
| 15 | 381286954 |
| 16 | 1289885834 |
| 17 | 4363653034 |
| 18 | 14762129274 |
| 19 | 49939929610 |
| 20 | 168945571442 |
| 21 | 571538767370 |
| 22 | 1933501811618 |
| 23 | 6540989771354 |