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 | 5 |
| 2 | 51 |
| 3 | 502 |
| 4 | 4995 |
| 5 | 49999 |
| 6 | 499980 |
| 7 | 4999995 |
| 8 | 50000202 |
| 9 | 499999731 |
| 10 | 5000005565 |
| 11 | 50000013114 |
| 12 | 499999997503 |
| 13 | 4999999971938 |
| 14 | 49999999974390 |
| 15 | 499999999976909 |
| 16 | 4999999999414101 |
| 17 | 50000000022964476 |
| 18 | 500000000029433861 |
| 19 | 4999999999986496894 |