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 | 1 |
| 2 | 260 |
| 3 | 7595 |
| 4 | 94360 |
| 5 | 723534 |
| 6 | 4037712 |
| 7 | 17944290 |
| 8 | 67127880 |
| 9 | 219319815 |
| 10 | 642251428 |
| 11 | 1718012933 |
| 12 | 4258676240 |
| 13 | 9892043980 |
| 14 | 21721707840 |
| 15 | 45414150132 |
| 16 | 90930820464 |
| 17 | 175208925885 |
| 18 | 326205634020 |
| 19 | 588861675535 |
| 20 | 1033717781096 |
| 21 | 1769137540730 |
| 22 | 2958360418000 |
| 23 | 4842936861750 |
| 24 | 7774492635000 |