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 | 4 |
| 5 | 2 |
| 6 | 8 |
| 7 | 12 |
| 8 | 30 |
| 9 | 70 |
| 10 | 664 |
| 11 | 1072 |
| 12 | 8768 |
| 13 | 11648 |
| 14 | 37108 |
| 15 | 95772 |
| 16 | 1059816 |
| 17 | 2047488 |
| 18 | 12111712 |
| 19 | 22802028 |
| 20 | 120779959 |
| 21 | 337801784 |
| 22 | 4361743860 |
| 23 | 11425028900 |
| 24 | 142573286216 |
| 25 | 429917269469 |
| 26 | 4138239848098 |
| 27 | 16171519847028 |
| 28 | 214845911686065 |