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 | 16 |
| 2 | 100 |
| 3 | 408 |
| 4 | 1290 |
| 5 | 3432 |
| 6 | 8052 |
| 7 | 17160 |
| 8 | 33891 |
| 9 | 62920 |
| 10 | 110968 |
| 11 | 187408 |
| 12 | 304980 |
| 13 | 480624 |
| 14 | 736440 |
| 15 | 1100784 |
| 16 | 1609509 |
| 17 | 2307360 |
| 18 | 3249532 |
| 19 | 4503400 |
| 20 | 6150430 |
| 21 | 8288280 |
| 22 | 11033100 |
| 23 | 14522040 |
| 24 | 18915975 |