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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 10 |
| 7 | 21 |
| 8 | 52 |
| 9 | 120 |
| 10 | 290 |
| 11 | 697 |
| 12 | 1713 |
| 13 | 4200 |
| 14 | 10446 |
| 15 | 26053 |
| 16 | 65473 |
| 17 | 165257 |
| 18 | 419357 |
| 19 | 1068239 |
| 20 | 2732509 |
| 21 | 7013242 |
| 22 | 18059960 |
| 23 | 46641983 |
| 24 | 120790324 |
| 25 | 313593621 |
| 26 | 816046050 |
| 27 | 2128101601 |
| 28 | 5560829666 |
| 29 | 14557746453 |
| 30 | 38177226541 |
| 31 | 100281484375 |
| 32 | 263815322761 |
| 33 | 695027102020 |