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 | 11 |
| 2 | 42 |
| 3 | 145 |
| 4 | 473 |
| 5 | 1484 |
| 6 | 4529 |
| 7 | 13543 |
| 8 | 39870 |
| 9 | 115937 |
| 10 | 333781 |
| 11 | 953056 |
| 12 | 2702497 |
| 13 | 7618115 |
| 14 | 21365778 |
| 15 | 59657329 |
| 16 | 165926609 |
| 17 | 459905588 |
| 18 | 1270819025 |
| 19 | 3501855007 |
| 20 | 9625627686 |
| 21 | 26398369601 |
| 22 | 72248624077 |
| 23 | 197361589960 |
| 24 | 538199264833 |