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 | 7 |
| 2 | 127 |
| 3 | 1093 |
| 4 | 5461 |
| 5 | 19531 |
| 6 | 55987 |
| 7 | 137257 |
| 8 | 299593 |
| 9 | 597871 |
| 10 | 1111111 |
| 11 | 1948717 |
| 12 | 3257437 |
| 13 | 5229043 |
| 14 | 8108731 |
| 15 | 12204241 |
| 16 | 17895697 |
| 17 | 25646167 |
| 18 | 36012943 |
| 19 | 49659541 |
| 20 | 67368421 |
| 21 | 90054427 |
| 22 | 118778947 |
| 23 | 154764793 |
| 24 | 199411801 |
| 25 | 254313151 |
| 26 | 321272407 |
| 27 | 402321277 |
| 28 | 499738093 |