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 | 55 |
| 1 | 144 |
| 2 | 343 |
| 3 | 720 |
| 4 | 1440 |
| 5 | 2770 |
| 6 | 5197 |
| 7 | 9564 |
| 8 | 17345 |
| 9 | 31090 |
| 10 | 55200 |
| 11 | 97236 |
| 12 | 170147 |
| 13 | 296040 |
| 14 | 512555 |
| 15 | 883620 |
| 16 | 1517568 |
| 17 | 2597606 |
| 18 | 4432985 |
| 19 | 7544820 |
| 20 | 12809845 |
| 21 | 21700934 |
| 22 | 36689088 |
| 23 | 61914600 |
| 24 | 104306575 |
| 25 | 175448640 |