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 | 3 |
| 4 | 11 |
| 5 | 46 |
| 6 | 201 |
| 7 | 928 |
| 8 | 4399 |
| 9 | 21431 |
| 10 | 106399 |
| 11 | 536896 |
| 12 | 2744532 |
| 13 | 14185314 |
| 14 | 73999955 |
| 15 | 389131156 |
| 16 | 2060478226 |
| 17 | 10976863244 |
| 18 | 58792036053 |
| 19 | 316397505099 |
| 20 | 1710037259744 |
| 21 | 9277953713444 |
| 22 | 50514377326158 |
| 23 | 275903656802218 |
| 24 | 1511334791637679 |
| 25 | 8300811367229306 |
| 26 | 45703063861360901 |