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 | 30 |
| 2 | 240 |
| 3 | 1010 |
| 4 | 2970 |
| 5 | 7002 |
| 6 | 14240 |
| 7 | 26070 |
| 8 | 44130 |
| 9 | 70310 |
| 10 | 106752 |
| 11 | 155850 |
| 12 | 220250 |
| 13 | 302850 |
| 14 | 406800 |
| 15 | 535502 |
| 16 | 692610 |
| 17 | 882030 |
| 18 | 1107920 |
| 19 | 1374690 |
| 20 | 1687002 |
| 21 | 2049770 |
| 22 | 2468160 |
| 23 | 2947590 |
| 24 | 3493730 |
| 25 | 4112502 |
| 26 | 4810080 |
| 27 | 5592890 |
| 28 | 6467610 |
| 29 | 7441170 |
| 30 | 8520752 |