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 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 31 |
| 4 | 90 |
| 5 | 222 |
| 6 | 520 |
| 7 | 1090 |
| 8 | 2180 |
| 9 | 4090 |
| 10 | 7356 |
| 11 | 12660 |
| 12 | 21105 |
| 13 | 34020 |
| 14 | 53460 |
| 15 | 81891 |
| 16 | 122826 |
| 17 | 180510 |
| 18 | 260746 |
| 19 | 370370 |
| 20 | 518518 |
| 21 | 715870 |
| 22 | 976170 |
| 23 | 1315470 |
| 24 | 1753975 |
| 25 | 2314936 |
| 26 | 3027224 |
| 27 | 3923845 |
| 28 | 5044920 |
| 29 | 6436200 |
| 30 | 8152542 |
| 31 | 10255896 |