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 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 44 |
| 6 | 168 |
| 7 | 716 |
| 8 | 3331 |
| 9 | 16599 |
| 10 | 87059 |
| 11 | 473569 |
| 12 | 2641428 |
| 13 | 14982656 |
| 14 | 85930423 |
| 15 | 496412949 |
| 16 | 2881216925 |
| 17 | 16773626497 |
| 18 | 97843056510 |
| 19 | 571457023718 |
| 20 | 3340356838651 |
| 21 | 19535838889479 |
| 22 | 114293073644447 |
| 23 | 668811749036809 |
| 24 | 3914263576403496 |