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 | 2 |
| 3 | 14 |
| 4 | 35 |
| 5 | 91 |
| 6 | 728 |
| 7 | 1976 |
| 8 | 5434 |
| 9 | 135850 |
| 10 | 380380 |
| 11 | 1071980 |
| 12 | 9111830 |
| 13 | 25933670 |
| 14 | 74096200 |
| 15 | 637227320 |
| 16 | 1832028545 |
| 17 | 5280552865 |
| 18 | 137294374490 |
| 19 | 397431084050 |
| 20 | 1152550143745 |
| 21 | 10043651252635 |
| 22 | 29217894553120 |
| 23 | 85112997176480 |