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 | 4 |
| 2 | 10 |
| 3 | 37 |
| 4 | 67 |
| 5 | 220 |
| 6 | 394 |
| 7 | 1285 |
| 8 | 2299 |
| 9 | 7492 |
| 10 | 13402 |
| 11 | 43669 |
| 12 | 78115 |
| 13 | 254524 |
| 14 | 455290 |
| 15 | 1483477 |
| 16 | 2653627 |
| 17 | 8646340 |
| 18 | 15466474 |
| 19 | 50394565 |
| 20 | 90145219 |
| 21 | 293721052 |
| 22 | 525404842 |
| 23 | 1711931749 |
| 24 | 3062283835 |
| 25 | 9977869444 |
| 26 | 17848298170 |
| 27 | 58155284917 |
| 28 | 104027505187 |
| 29 | 338953840060 |