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 | 15 |
| 2 | 225 |
| 3 | 240 |
| 4 | 768 |
| 5 | 1872 |
| 6 | 4216 |
| 7 | 10000 |
| 8 | 24420 |
| 9 | 59616 |
| 10 | 138724 |
| 11 | 336400 |
| 12 | 811240 |
| 13 | 1923276 |
| 14 | 4654480 |
| 15 | 11091620 |
| 16 | 26621504 |
| 17 | 64022280 |
| 18 | 152678176 |
| 19 | 367544432 |
| 20 | 879654400 |
| 21 | 2106871848 |
| 22 | 5061876412 |
| 23 | 12106779344 |
| 24 | 29061344972 |
| 25 | 69658807392 |
| 26 | 166845800312 |