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 | 5 |
| 2 | 25 |
| 3 | 65 |
| 4 | 85 |
| 5 | 445 |
| 6 | 1165 |
| 7 | 1525 |
| 8 | 7985 |
| 9 | 20905 |
| 10 | 27365 |
| 11 | 143285 |
| 12 | 375125 |
| 13 | 491045 |
| 14 | 2571145 |
| 15 | 6731345 |
| 16 | 8811445 |
| 17 | 46137325 |
| 18 | 120789085 |
| 19 | 158114965 |
| 20 | 827900705 |
| 21 | 2167472185 |
| 22 | 2837257925 |
| 23 | 14856075365 |
| 24 | 38893710245 |
| 25 | 50912527685 |
| 26 | 266581455865 |