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 | 4 |
| 3 | 9 |
| 4 | 32 |
| 5 | 75 |
| 6 | 318 |
| 7 | 931 |
| 8 | 3712 |
| 9 | 13014 |
| 10 | 50110 |
| 11 | 184767 |
| 12 | 715656 |
| 13 | 2704169 |
| 14 | 10454976 |
| 15 | 40126395 |
| 16 | 155462016 |
| 17 | 601080407 |
| 18 | 2335849578 |
| 19 | 9075135319 |
| 20 | 35359120940 |
| 21 | 137847221148 |
| 22 | 538346579034 |
| 23 | 2104098963743 |
| 24 | 8234009441952 |
| 25 | 32247603785500 |
| 26 | 126414311404108 |
| 27 | 495918587420145 |