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 | 2 |
| 3 | 6 |
| 4 | 19 |
| 5 | 51 |
| 6 | 148 |
| 7 | 395 |
| 8 | 1095 |
| 9 | 2945 |
| 10 | 8020 |
| 11 | 21597 |
| 12 | 58518 |
| 13 | 157746 |
| 14 | 426250 |
| 15 | 1149832 |
| 16 | 3104236 |
| 17 | 8375167 |
| 18 | 22603530 |
| 19 | 60988687 |
| 20 | 164579663 |
| 21 | 444082316 |
| 22 | 1198312390 |
| 23 | 3233419264 |
| 24 | 8724918311 |
| 25 | 23542640336 |
| 26 | 63526028693 |
| 27 | 171413973501 |
| 28 | 462531951559 |
| 29 | 1248062990751 |
| 30 | 3367686427976 |