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 | 5 |
| 2 | 30 |
| 3 | 123 |
| 4 | 472 |
| 5 | 1790 |
| 6 | 6794 |
| 7 | 25879 |
| 8 | 98952 |
| 9 | 379674 |
| 10 | 1461248 |
| 11 | 5638930 |
| 12 | 21811540 |
| 13 | 84542016 |
| 14 | 328287506 |
| 15 | 1276868111 |
| 16 | 4973645576 |
| 17 | 19398954626 |
| 18 | 75753497816 |
| 19 | 296142817406 |
| 20 | 1158865623236 |
| 21 | 4539024407576 |
| 22 | 17793358627976 |
| 23 | 69805770185498 |
| 24 | 274055019608372 |
| 25 | 1076651019788200 |