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 | 6 |
| 2 | 60 |
| 3 | 330 |
| 4 | 1224 |
| 5 | 3510 |
| 6 | 8436 |
| 7 | 17850 |
| 8 | 34320 |
| 9 | 61254 |
| 10 | 103020 |
| 11 | 165066 |
| 12 | 254040 |
| 13 | 377910 |
| 14 | 546084 |
| 15 | 769530 |
| 16 | 1060896 |
| 17 | 1434630 |
| 18 | 1907100 |
| 19 | 2496714 |
| 20 | 3224040 |
| 21 | 4111926 |
| 22 | 5185620 |
| 23 | 6472890 |
| 24 | 8004144 |
| 25 | 9812550 |
| 26 | 11934156 |
| 27 | 14408010 |
| 28 | 17276280 |
| 29 | 20584374 |
| 30 | 24381060 |