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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 15 |
| 6 | 41 |
| 7 | 96 |
| 8 | 288 |
| 9 | 724 |
| 10 | 2142 |
| 11 | 5838 |
| 12 | 17720 |
| 13 | 49871 |
| 14 | 151846 |
| 15 | 440915 |
| 16 | 1363821 |
| 17 | 4019460 |
| 18 | 12460721 |
| 19 | 37374098 |
| 20 | 116809752 |
| 21 | 353904962 |
| 22 | 1109745666 |
| 23 | 3396806188 |
| 24 | 10712261952 |
| 25 | 33006706419 |
| 26 | 104357272687 |
| 27 | 323794643722 |
| 28 | 1027723460639 |
| 29 | 3204413808420 |
| 30 | 10193485256501 |