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 | 3 |
| 1 | 7 |
| 2 | 45 |
| 3 | 97 |
| 4 | 627 |
| 5 | 1351 |
| 6 | 8733 |
| 7 | 18817 |
| 8 | 121635 |
| 9 | 262087 |
| 10 | 1694157 |
| 11 | 3650401 |
| 12 | 23596563 |
| 13 | 50843527 |
| 14 | 328657725 |
| 15 | 708158977 |
| 16 | 4577611587 |
| 17 | 9863382151 |
| 18 | 63757904493 |
| 19 | 137379191137 |
| 20 | 888033051315 |
| 21 | 1913445293767 |
| 22 | 12368704813917 |