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 | 5 |
| 2 | 21 |
| 3 | 34 |
| 4 | 144 |
| 5 | 610 |
| 6 | 987 |
| 7 | 24157817 |
| 8 | 7540113804746346429 |
| 9 | 18547707689471986212190138521399707760 |
| 10 | 382699285659014174244530850035136059033084785 |