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 | 1 |
| 2 | 4 |
| 3 | 6 |
| 4 | 18 |
| 5 | 32 |
| 6 | 84 |
| 7 | 164 |
| 8 | 400 |
| 9 | 824 |
| 10 | 1928 |
| 11 | 4096 |
| 12 | 9360 |
| 13 | 20240 |
| 14 | 45632 |
| 15 | 99680 |
| 16 | 223008 |
| 17 | 489984 |
| 18 | 1091392 |
| 19 | 2405952 |
| 20 | 5345536 |
| 21 | 11806592 |
| 22 | 26194048 |
| 23 | 57917440 |
| 24 | 128389376 |
| 25 | 284057856 |
| 26 | 629392384 |
| 27 | 1393010176 |
| 28 | 3085685248 |
| 29 | 6830825472 |
| 30 | 15128761344 |