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 | -1 |
| 2 | 9 |
| 3 | 55 |
| 4 | 161 |
| 5 | 351 |
| 6 | 649 |
| 7 | 1079 |
| 8 | 1665 |
| 9 | 2431 |
| 10 | 3401 |
| 11 | 4599 |
| 12 | 6049 |
| 13 | 7775 |
| 14 | 9801 |
| 15 | 12151 |
| 16 | 14849 |
| 17 | 17919 |
| 18 | 21385 |
| 19 | 25271 |
| 20 | 29601 |
| 21 | 34399 |
| 22 | 39689 |
| 23 | 45495 |
| 24 | 51841 |
| 25 | 58751 |
| 26 | 66249 |
| 27 | 74359 |
| 28 | 83105 |
| 29 | 92511 |
| 30 | 102601 |
| 31 | 113399 |
| 32 | 124929 |
| 33 | 137215 |
| 34 | 150281 |
| 35 | 164151 |
| 36 | 178849 |
| 37 | 194399 |
| 38 | 210825 |
| 39 | 228151 |