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 | 23 |
| 2 | 212 |
| 3 | 1629 |
| 4 | 11180 |
| 5 | 71501 |
| 6 | 434721 |
| 7 | 2553223 |
| 8 | 14601638 |
| 9 | 81799885 |
| 10 | 450682446 |
| 11 | 2449953613 |
| 12 | 13173208338 |
| 13 | 70201196318 |
| 14 | 371356326457 |
| 15 | 1952380236002 |
| 16 | 10211349328475 |
| 17 | 53172089972396 |
| 18 | 275828459680751 |
| 19 | 1426182115328813 |