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 | 3 |
| 3 | 20 |
| 4 | 23 |
| 5 | 66 |
| 6 | 947 |
| 7 | 1960 |
| 8 | 2907 |
| 9 | 19402 |
| 10 | 22309 |
| 11 | 64020 |
| 12 | 918589 |
| 13 | 1901198 |
| 14 | 2819787 |
| 15 | 18819920 |
| 16 | 21639707 |
| 17 | 62099334 |
| 18 | 891030383 |
| 19 | 1844160100 |
| 20 | 2735190483 |
| 21 | 18255302998 |
| 22 | 20990493481 |
| 23 | 60236289960 |
| 24 | 864298552921 |
| 25 | 1788833395802 |
| 26 | 2653131948723 |
| 27 | 17707625088140 |