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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 11 |
| 6 | 33 |
| 7 | 114 |
| 8 | 438 |
| 9 | 1845 |
| 10 | 8458 |
| 11 | 41823 |
| 12 | 221539 |
| 13 | 1250269 |
| 14 | 7481758 |
| 15 | 47278652 |
| 16 | 314374316 |
| 17 | 2192798077 |
| 18 | 16000160519 |
| 19 | 121831654450 |
| 20 | 965946444587 |
| 21 | 7958739329386 |
| 22 | 68023023892680 |
| 23 | 602115897105136 |
| 24 | 5511499584735858 |