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 | -1 |
| 2 | 4 |
| 3 | 45 |
| 4 | 176 |
| 5 | 475 |
| 6 | 1044 |
| 7 | 2009 |
| 8 | 3520 |
| 9 | 5751 |
| 10 | 8900 |
| 11 | 13189 |
| 12 | 18864 |
| 13 | 26195 |
| 14 | 35476 |
| 15 | 47025 |
| 16 | 61184 |
| 17 | 78319 |
| 18 | 98820 |
| 19 | 123101 |
| 20 | 151600 |
| 21 | 184779 |
| 22 | 223124 |
| 23 | 267145 |
| 24 | 317376 |
| 25 | 374375 |
| 26 | 438724 |
| 27 | 511029 |
| 28 | 591920 |
| 29 | 682051 |
| 30 | 782100 |
| 31 | 892769 |