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 | 2 |
| 1 | 7 |
| 2 | 53 |
| 3 | 311 |
| 4 | 1619 |
| 5 | 8161 |
| 6 | 38873 |
| 7 | 180503 |
| 8 | 821641 |
| 9 | 3681131 |
| 10 | 16290047 |
| 11 | 71378569 |
| 12 | 310248241 |
| 13 | 1339484197 |
| 14 | 5750079047 |
| 15 | 24563311309 |
| 16 | 104484802057 |
| 17 | 442795487221 |
| 18 | 1870358526653 |
| 19 | 7877263558621 |
| 20 | 33089240375501 |
| 21 | 138666449011757 |
| 22 | 579863159340527 |
| 23 | 2420094683001859 |
| 24 | 10082409897709157 |