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 | 2 |
| 2 | 9 |
| 3 | 27 |
| 4 | 65 |
| 5 | 135 |
| 6 | 252 |
| 7 | 434 |
| 8 | 702 |
| 9 | 1080 |
| 10 | 1595 |
| 11 | 2277 |
| 12 | 3159 |
| 13 | 4277 |
| 14 | 5670 |
| 15 | 7380 |
| 16 | 9452 |
| 17 | 11934 |
| 18 | 14877 |
| 19 | 18335 |
| 20 | 22365 |
| 21 | 27027 |
| 22 | 32384 |
| 23 | 38502 |
| 24 | 45450 |
| 25 | 53300 |
| 26 | 62127 |
| 27 | 72009 |
| 28 | 83027 |
| 29 | 95265 |
| 30 | 108810 |
| 31 | 123752 |
| 32 | 140184 |
| 33 | 158202 |
| 34 | 177905 |
| 35 | 199395 |
| 36 | 222777 |
| 37 | 248159 |
| 38 | 275652 |
| 39 | 305370 |
| 40 | 337430 |