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 | 1 |
| 1 | 5 |
| 2 | 14 |
| 3 | 53 |
| 4 | 178 |
| 5 | 685 |
| 6 | 2548 |
| 7 | 9876 |
| 8 | 37950 |
| 9 | 147520 |
| 10 | 572594 |
| 11 | 2230735 |
| 12 | 8693932 |
| 13 | 33939465 |
| 14 | 132598484 |
| 15 | 518607032 |
| 16 | 2029990774 |
| 17 | 7952788446 |
| 18 | 31179668572 |
| 19 | 122331725930 |
| 20 | 480283816348 |
| 21 | 1886829349570 |
| 22 | 7416950176904 |
| 23 | 29171683995320 |
| 24 | 114795961678380 |
| 25 | 451968102200966 |
| 26 | 1780298693036010 |