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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 46 |
| 6 | 107 |
| 7 | 252 |
| 8 | 599 |
| 9 | 1435 |
| 10 | 3460 |
| 11 | 8389 |
| 12 | 20437 |
| 13 | 49996 |
| 14 | 122758 |
| 15 | 302401 |
| 16 | 747114 |
| 17 | 1850696 |
| 18 | 4595370 |
| 19 | 11435380 |
| 20 | 28513149 |
| 21 | 71225270 |
| 22 | 178219696 |
| 23 | 446637759 |
| 24 | 1120946389 |
| 25 | 2817089354 |
| 26 | 7088656546 |
| 27 | 17858286741 |
| 28 | 45039810918 |
| 29 | 113711798916 |
| 30 | 287369435649 |
| 31 | 726905294670 |
| 32 | 1840328917065 |