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 | 0 |
| 1 | 132 |
| 2 | 9996 |
| 3 | 92092 |
| 4 | 451269 |
| 5 | 1570800 |
| 6 | 4395118 |
| 7 | 10559208 |
| 8 | 22664655 |
| 9 | 44602348 |
| 10 | 81921840 |
| 11 | 142247364 |
| 12 | 235740505 |
| 13 | 375609528 |
| 14 | 578665362 |
| 15 | 865924240 |
| 16 | 1263256995 |
| 17 | 1802085012 |
| 18 | 2520122836 |
| 19 | 3462167436 |
| 20 | 4680934125 |
| 21 | 6237939136 |
| 22 | 8204428854 |
| 23 | 10662355704 |
| 24 | 13705400695 |