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 | 2 |
| 3 | 3 |
| 4 | 28 |
| 5 | 29 |
| 6 | 1119 |
| 7 | 6133 |
| 8 | 6134 |
| 9 | 1141774 |
| 10 | 6851892 |
| 11 | 6854270 |
| 12 | 6854271 |
| 13 | 6880561 |
| 14 | 219181118 |
| 15 | 1113539751 |
| 16 | 1187863323 |
| 17 | 1200376103 |
| 18 | 1247070050 |
| 19 | 1247070068 |
| 20 | 1247070100 |
| 21 | 1247070104 |
| 22 | 1247070130 |
| 23 | 1251287495 |
| 24 | 1252760510 |
| 25 | 1257001167 |
| 26 | 40920315565 |
| 27 | 41404469929 |
| 28 | 41473080530 |