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 | 4 |
| 2 | 42 |
| 3 | 453 |
| 4 | 4668 |
| 5 | 47372 |
| 6 | 478361 |
| 7 | 4820082 |
| 8 | 48461680 |
| 9 | 486543007 |
| 10 | 4880365186 |
| 11 | 48922874243 |
| 12 | 490205054291 |
| 13 | 4910186835993 |
| 14 | 49170709786317 |
| 15 | 492297202098380 |
| 16 | 4928087057164426 |
| 17 | 49325636340385940 |
| 18 | 493651449428949382 |
| 19 | 4940027276202057447 |
| 20 | 49431711317962542892 |
| 21 | 494600136049092471546 |