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 | 152 |
| 3 | 1088 |
| 4 | 6460 |
| 5 | 33440 |
| 6 | 155584 |
| 7 | 663936 |
| 8 | 2636326 |
| 9 | 9845040 |
| 10 | 34861152 |
| 11 | 117809728 |
| 12 | 381946360 |
| 13 | 1193074144 |
| 14 | 3603543040 |
| 15 | 10556065152 |
| 16 | 30068145905 |
| 17 | 83466484112 |
| 18 | 226236086512 |
| 19 | 599785472000 |
| 20 | 1557643542308 |
| 21 | 3967888347232 |
| 22 | 9926348625408 |
| 23 | 24413219138816 |