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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 16 |
| 4 | 36 |
| 5 | 171 |
| 6 | 512 |
| 7 | 2087 |
| 8 | 6984 |
| 9 | 26512 |
| 10 | 92682 |
| 11 | 341573 |
| 12 | 1216512 |
| 13 | 4429309 |
| 14 | 15898766 |
| 15 | 57595536 |
| 16 | 207410832 |
| 17 | 749793263 |
| 18 | 2703799808 |
| 19 | 9765692771 |
| 20 | 35235657396 |
| 21 | 127218945296 |
| 22 | 459128080534 |
| 23 | 1657436539337 |
| 24 | 5982212358144 |
| 25 | 21594204190521 |