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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 28 |
| 7 | 70 |
| 8 | 169 |
| 9 | 420 |
| 10 | 1030 |
| 11 | 2546 |
| 12 | 6266 |
| 13 | 15452 |
| 14 | 38056 |
| 15 | 93774 |
| 16 | 230993 |
| 17 | 569084 |
| 18 | 1401913 |
| 19 | 3453690 |
| 20 | 8508214 |
| 21 | 20960336 |
| 22 | 51636447 |
| 23 | 127208350 |
| 24 | 313382262 |
| 25 | 772028708 |
| 26 | 1901920456 |
| 27 | 4685449914 |
| 28 | 11542774524 |
| 29 | 28436041324 |
| 30 | 70053211913 |
| 31 | 172578611878 |