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 | 2 |
| 2 | 7 |
| 3 | 36 |
| 4 | 253 |
| 5 | 2278 |
| 6 | 25059 |
| 7 | 325768 |
| 8 | 4886521 |
| 9 | 83070858 |
| 10 | 1578346303 |
| 11 | 33145272364 |
| 12 | 762341264373 |
| 13 | 19058531609326 |
| 14 | 514580353451803 |
| 15 | 14922830250102288 |
| 16 | 462607737753170929 |
| 17 | 15266055345854640658 |
| 18 | 534311937104912423031 |