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) |
|---|---|
| 2 | 5 |
| 3 | 135 |
| 4 | 1836 |
| 5 | 12675 |
| 6 | 58941 |
| 7 | 211925 |
| 8 | 635440 |
| 9 | 1663821 |
| 10 | 3921325 |
| 11 | 8495531 |
| 12 | 17179020 |
| 13 | 32795295 |
| 14 | 59626581 |
| 15 | 103962825 |
| 16 | 174792896 |
| 17 | 284660665 |
| 18 | 450710325 |
| 19 | 695946991 |
| 20 | 1050740300 |
| 21 | 1554600411 |
| 22 | 2258257485 |
| 23 | 3226077405 |
| 24 | 4538848176 |
| 25 | 6296973125 |
| 26 | 8624108701 |
| 27 | 11671286355 |