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 | 6 |
| 3 | 37 |
| 4 | 236 |
| 5 | 1517 |
| 6 | 9770 |
| 7 | 62953 |
| 8 | 405688 |
| 9 | 2614457 |
| 10 | 16849006 |
| 11 | 108584525 |
| 12 | 699780452 |
| 13 | 4509783909 |
| 14 | 29063617746 |
| 15 | 187302518353 |
| 16 | 1207084188912 |
| 17 | 7779138543857 |
| 18 | 50133202843990 |
| 19 | 323086934794997 |
| 20 | 2082156365731164 |
| 21 | 13418602439355485 |
| 22 | 86477122654688250 |
| 23 | 557307869909156153 |