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 | 0 |
| 2 | 1 |
| 3 | 14 |
| 4 | 215 |
| 5 | 3162 |
| 6 | 46415 |
| 7 | 681291 |
| 8 | 681292 |
| 9 | 9999999 |
| 10 | 10000000 |
| 11 | 146779926 |
| 12 | 2154434689 |
| 13 | 2154434690 |
| 14 | 31622776601 |
| 15 | 464158883361 |
| 16 | 6812920690579 |
| 17 | 99999999999999 |
| 18 | 100000000000000 |
| 19 | 1467799267622069 |
| 20 | 21544346900318837 |
| 21 | 316227766016837933 |
| 22 | 4641588833612778892 |
| 23 | 68129206905796128549 |