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 | 1 |
| 2 | 12 |
| 3 | 32 |
| 4 | 112 |
| 5 | 416 |
| 6 | 1512 |
| 7 | 5472 |
| 8 | 19904 |
| 9 | 72396 |
| 10 | 263136 |
| 11 | 956480 |
| 12 | 3477232 |
| 13 | 12641136 |
| 14 | 45954928 |
| 15 | 167063792 |
| 16 | 607344064 |
| 17 | 2207938656 |
| 18 | 8026742304 |
| 19 | 29180448720 |
| 20 | 106082737616 |
| 21 | 385653691936 |
| 22 | 1402007389776 |
| 23 | 5096865080336 |
| 24 | 18529170684512 |