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 | 7 |
| 2 | 28 |
| 3 | 106 |
| 4 | 388 |
| 5 | 1387 |
| 6 | 4874 |
| 7 | 16919 |
| 8 | 58198 |
| 9 | 198807 |
| 10 | 675372 |
| 11 | 2283994 |
| 12 | 7695280 |
| 13 | 25845198 |
| 14 | 86568033 |
| 15 | 289279804 |
| 16 | 964690182 |
| 17 | 3211220933 |
| 18 | 10672137362 |
| 19 | 35416362298 |
| 20 | 117378654202 |
| 21 | 388561273645 |
| 22 | 1284874248757 |
| 23 | 4244554964082 |