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 | 21 |
| 2 | 297 |
| 3 | 2213 |
| 4 | 25529 |
| 5 | 262707 |
| 6 | 2602065 |
| 7 | 27085621 |
| 8 | 276224518 |
| 9 | 2819029784 |
| 10 | 28899641330 |
| 11 | 295437343180 |
| 12 | 3022217370837 |
| 13 | 30925095105256 |
| 14 | 316343570292406 |
| 15 | 3236407313791828 |
| 16 | 33110664446316449 |
| 17 | 338735015559436300 |