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 | 266 |
| 2 | 1389 |
| 3 | 6102 |
| 4 | 20934 |
| 5 | 141262 |
| 6 | 306062 |
| 7 | 607533 |
| 8 | 1968990 |
| 9 | 5266030 |
| 10 | 17975982 |
| 11 | 25748166 |
| 12 | 49814254 |
| 13 | 155087838 |
| 14 | 254757166 |
| 15 | 402919341 |
| 16 | 616857990 |
| 17 | 918109966 |
| 18 | 1109537246 |
| 19 | 2639036782 |
| 20 | 4871910150 |
| 21 | 6475547950 |
| 22 | 11018764446 |
| 23 | 14135789614 |
| 24 | 22598970438 |
| 25 | 42920560350 |