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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 23 |
| 6 | 53 |
| 7 | 374 |
| 8 | 613 |
| 9 | 225460 |
| 10 | 490537 |
| 11 | 1748155 |
| 12 | 3167982 |
| 13 | 9266618 |
| 14 | 12543856 |
| 15 | 12589961 |
| 16 | 27359852 |
| 17 | 3418801560 |
| 18 | 8824909730 |
| 19 | 72988555402 |