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 | 1 |
| 1 | 4 |
| 2 | 34 |
| 3 | 322 |
| 4 | 3164 |
| 5 | 31484 |
| 6 | 314662 |
| 7 | 3149674 |
| 8 | 31544384 |
| 9 | 315981452 |
| 10 | 3165414034 |
| 11 | 31710994234 |
| 12 | 317682195692 |
| 13 | 3182564368244 |
| 14 | 31883205466534 |
| 15 | 319408833724882 |
| 16 | 3199866987994304 |
| 17 | 32056562443839284 |
| 18 | 321145602837871522 |
| 19 | 3217266324544621714 |
| 20 | 32230871396722195484 |