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 | 65 |
| 2 | 210 |
| 3 | 536 |
| 4 | 1264 |
| 5 | 2880 |
| 6 | 6448 |
| 7 | 14288 |
| 8 | 31440 |
| 9 | 68816 |
| 10 | 149968 |
| 11 | 325584 |
| 12 | 704464 |
| 13 | 1519568 |
| 14 | 3268560 |
| 15 | 7012304 |
| 16 | 15007696 |
| 17 | 32047056 |
| 18 | 68288464 |
| 19 | 145227728 |
| 20 | 308281296 |
| 21 | 653262800 |
| 22 | 1382023120 |
| 23 | 2919235536 |
| 24 | 6157238224 |
| 25 | 12968787920 |