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 | 12 |
| 4 | 73 |
| 5 | 503 |
| 6 | 3661 |
| 7 | 27715 |
| 8 | 214664 |
| 9 | 1691049 |
| 10 | 13494718 |
| 11 | 108864742 |
| 12 | 886520081 |
| 13 | 7279644889 |
| 14 | 60225617740 |
| 15 | 501640531350 |
| 16 | 4204146605148 |
| 17 | 35432735188076 |
| 18 | 300170956721542 |
| 19 | 2554988646383521 |
| 20 | 21842628856370472 |
| 21 | 187487872615533629 |
| 22 | 1615346166853635465 |
| 23 | 13965841907774754081 |