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 | 2 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 7 |
| 6 | 17 |
| 7 | 39 |
| 8 | 102 |
| 9 | 258 |
| 10 | 651 |
| 11 | 1620 |
| 12 | 4028 |
| 13 | 9956 |
| 14 | 24588 |
| 15 | 60742 |
| 16 | 150108 |
| 17 | 371689 |
| 18 | 921822 |
| 19 | 2291257 |
| 20 | 5706077 |
| 21 | 14240518 |
| 22 | 35607189 |
| 23 | 89202758 |
| 24 | 223857382 |
| 25 | 562716179 |
| 26 | 1416686294 |
| 27 | 3571809027 |
| 28 | 9017514253 |
| 29 | 22794726763 |