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 | 14 |
| 4 | 107 |
| 5 | 103 |
| 6 | 851 |
| 7 | 6931 |
| 8 | 59557 |
| 9 | 518971 |
| 10 | 4585526 |
| 11 | 41368791 |
| 12 | 375232730 |
| 13 | 3441863700 |
| 14 | 31843327587 |
| 15 | 295907384843 |
| 16 | 2761221438054 |
| 17 | 25890141962275 |
| 18 | 244138314690159 |
| 19 | 2306482418751769 |
| 20 | 21874074143081175 |
| 21 | 208132164249925671 |
| 22 | 1983046852246630734 |
| 23 | 18946883921641542673 |