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) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 65 |
| 3 | 320 |
| 4 | 1320 |
| 5 | 4752 |
| 6 | 15400 |
| 7 | 45760 |
| 8 | 126500 |
| 9 | 328680 |
| 10 | 809380 |
| 11 | 1901120 |
| 12 | 4282200 |
| 13 | 9289840 |
| 14 | 19482200 |
| 15 | 39619008 |
| 16 | 78337930 |
| 17 | 150954980 |
| 18 | 284060810 |
| 19 | 522920640 |
| 20 | 943206264 |
| 21 | 1669294000 |
| 22 | 2902420600 |
| 23 | 4963400000 |