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 | 5 |
| 1 | 25 |
| 2 | 145 |
| 3 | 865 |
| 4 | 5185 |
| 5 | 31105 |
| 6 | 186625 |
| 7 | 1119745 |
| 8 | 6718465 |
| 9 | 40310785 |
| 10 | 241864705 |
| 11 | 1451188225 |
| 12 | 8707129345 |
| 13 | 52242776065 |
| 14 | 313456656385 |
| 15 | 1880739938305 |
| 16 | 11284439629825 |
| 17 | 67706637778945 |
| 18 | 406239826673665 |
| 19 | 2437438960041985 |
| 20 | 14624633760251905 |