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 | 5 |
| 1 | 9 |
| 2 | 19 |
| 3 | 43 |
| 4 | 102 |
| 5 | 250 |
| 6 | 628 |
| 7 | 1608 |
| 8 | 4181 |
| 9 | 11009 |
| 10 | 29295 |
| 11 | 78655 |
| 12 | 212815 |
| 13 | 579675 |
| 14 | 1588245 |
| 15 | 4374285 |
| 16 | 12103407 |
| 17 | 33628827 |
| 18 | 93786969 |
| 19 | 262450881 |
| 20 | 736710360 |
| 21 | 2073834420 |
| 22 | 5853011850 |
| 23 | 16558618510 |
| 24 | 46949351275 |
| 25 | 133390812255 |
| 26 | 379708642289 |
| 27 | 1082797114049 |
| 28 | 3092894319078 |
| 29 | 8848275403642 |