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 | 7 |
| 2 | 49 |
| 3 | 211 |
| 4 | 811 |
| 5 | 2791 |
| 6 | 9055 |
| 7 | 28081 |
| 8 | 84403 |
| 9 | 247705 |
| 10 | 713857 |
| 11 | 2027929 |
| 12 | 5695201 |
| 13 | 15845455 |
| 14 | 43747201 |
| 15 | 120004363 |
| 16 | 327401947 |
| 17 | 889103743 |
| 18 | 2404885423 |
| 19 | 6482464537 |
| 20 | 17421401395 |
| 21 | 46696588561 |
| 22 | 124877198881 |
| 23 | 333267920209 |
| 24 | 887801858209 |