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 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 39 |
| 5 | 127 |
| 6 | 476 |
| 7 | 1717 |
| 8 | 6474 |
| 9 | 24321 |
| 10 | 92508 |
| 11 | 352717 |
| 12 | 1352589 |
| 13 | 5200301 |
| 14 | 20060020 |
| 15 | 77558897 |
| 16 | 300546669 |
| 17 | 1166803111 |
| 18 | 4537592436 |
| 19 | 17672631901 |
| 20 | 68923356953 |
| 21 | 269128938947 |
| 22 | 1052049834580 |
| 23 | 4116715363801 |
| 24 | 16123803200574 |
| 25 | 63205303219003 |
| 26 | 247959271674356 |