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 | 144 |
| 3 | 1444 |
| 4 | 44944 |
| 5 | 6441444 |
| 6 | 47444544 |
| 7 | 4434494464 |
| 8 | 44424414441 |
| 9 | 4243443441444 |
| 10 | 44844344414464 |
| 11 | 444431244445444 |
| 12 | 44044624434444544 |
| 13 | 441544444344443449 |
| 14 | 14444545446449449444 |
| 15 | 346454444084444444644 |
| 16 | 44024844440444424044544 |
| 17 | 444448493447444044441744 |