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 | 6 |
| 1 | 49 |
| 2 | 225 |
| 3 | 765 |
| 4 | 2145 |
| 5 | 5247 |
| 6 | 11583 |
| 7 | 23595 |
| 8 | 45045 |
| 9 | 81510 |
| 10 | 140998 |
| 11 | 234702 |
| 12 | 377910 |
| 13 | 591090 |
| 14 | 901170 |
| 15 | 1343034 |
| 16 | 1961256 |
| 17 | 2812095 |
| 18 | 3965775 |
| 19 | 5509075 |
| 20 | 7548255 |
| 21 | 10212345 |
| 22 | 13656825 |
| 23 | 18067725 |
| 24 | 23666175 |
| 25 | 30713436 |
| 26 | 39516444 |
| 27 | 50433900 |
| 28 | 63882940 |