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 | 3 |
| 2 | 6 |
| 3 | 10 |
| 4 | 21 |
| 5 | 39 |
| 6 | 92 |
| 7 | 198 |
| 8 | 498 |
| 9 | 1219 |
| 10 | 3210 |
| 11 | 8418 |
| 12 | 22913 |
| 13 | 62415 |
| 14 | 173088 |
| 15 | 481598 |
| 16 | 1351983 |
| 17 | 3808083 |
| 18 | 10781954 |
| 19 | 30615354 |
| 20 | 87230157 |
| 21 | 249144711 |
| 22 | 713387076 |
| 23 | 2046856566 |
| 24 | 5884491500 |
| 25 | 16946569371 |
| 26 | 48883660146 |
| 27 | 141217160458 |
| 28 | 408519019449 |
| 29 | 1183289542815 |