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 | 70 |
| 1 | 630 |
| 2 | 3150 |
| 3 | 11550 |
| 4 | 34650 |
| 5 | 90090 |
| 6 | 210210 |
| 7 | 450450 |
| 8 | 900900 |
| 9 | 1701700 |
| 10 | 3063060 |
| 11 | 5290740 |
| 12 | 8817900 |
| 13 | 14244300 |
| 14 | 22383900 |
| 15 | 34321980 |
| 16 | 51482970 |
| 17 | 75710250 |
| 18 | 109359250 |
| 19 | 155405250 |
| 20 | 217567350 |
| 21 | 300450150 |
| 22 | 409704750 |
| 23 | 552210750 |
| 24 | 736281000 |
| 25 | 971890920 |
| 26 | 1270934280 |
| 27 | 1647507400 |
| 28 | 2118223800 |