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 | 3 |
| 2 | 6 |
| 3 | 10 |
| 4 | 28 |
| 5 | 73 |
| 6 | 196 |
| 7 | 515 |
| 8 | 1376 |
| 9 | 3686 |
| 10 | 9914 |
| 11 | 26681 |
| 12 | 71876 |
| 13 | 193749 |
| 14 | 522510 |
| 15 | 1409414 |
| 16 | 3802164 |
| 17 | 10257707 |
| 18 | 27675148 |
| 19 | 74669353 |
| 20 | 201466240 |
| 21 | 543583450 |
| 22 | 1466670482 |
| 23 | 3957312647 |
| 24 | 10677488468 |
| 25 | 28809678971 |
| 26 | 77733469590 |
| 27 | 209738364682 |