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 | 2 |
| 4 | 4 |
| 5 | 11 |
| 6 | 29 |
| 7 | 83 |
| 8 | 251 |
| 9 | 767 |
| 10 | 2403 |
| 11 | 7652 |
| 12 | 24758 |
| 13 | 80875 |
| 14 | 266803 |
| 15 | 887330 |
| 16 | 2972108 |
| 17 | 10016981 |
| 18 | 33942461 |
| 19 | 115572864 |
| 20 | 395226810 |
| 21 | 1356840007 |
| 22 | 4674552089 |
| 23 | 16156355357 |
| 24 | 56003840659 |
| 25 | 194651585875 |
| 26 | 678220460687 |
| 27 | 2368505647624 |
| 28 | 8288873657180 |
| 29 | 29064904732911 |