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 | 2 |
| 2 | 19 |
| 3 | 113 |
| 4 | 617 |
| 5 | 1877 |
| 6 | 8753 |
| 7 | 52517 |
| 8 | 255043 |
| 9 | 1532173 |
| 10 | 9287521 |
| 11 | 48499459 |
| 12 | 353653063 |
| 13 | 2136716521 |
| 14 | 18171787987 |
| 15 | 111795382441 |