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 | 3 |
| 2 | 11 |
| 3 | 54 |
| 4 | 179 |
| 5 | 648 |
| 6 | 2414 |
| 7 | 8809 |
| 8 | 32195 |
| 9 | 117945 |
| 10 | 431696 |
| 11 | 1579955 |
| 12 | 5783294 |
| 13 | 21168592 |
| 14 | 77482521 |
| 15 | 283608249 |
| 16 | 1038086883 |
| 17 | 3799689944 |
| 18 | 13907938601 |
| 19 | 50906985592 |
| 20 | 186333942984 |
| 21 | 682034858839 |
| 22 | 2496440225499 |
| 23 | 9137676323347 |
| 24 | 33446476209566 |
| 25 | 122423549667123 |