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 | 5 |
| 3 | 47 |
| 4 | 203 |
| 5 | 623 |
| 6 | 1553 |
| 7 | 3359 |
| 8 | 6551 |
| 9 | 11807 |
| 10 | 19997 |
| 11 | 32207 |
| 12 | 49763 |
| 13 | 74255 |
| 14 | 107561 |
| 15 | 151871 |
| 16 | 209711 |
| 17 | 283967 |
| 18 | 377909 |
| 19 | 495215 |
| 20 | 639995 |
| 21 | 816815 |
| 22 | 1030721 |
| 23 | 1287263 |
| 24 | 1592519 |
| 25 | 1953119 |
| 26 | 2376269 |
| 27 | 2869775 |
| 28 | 3442067 |
| 29 | 4102223 |
| 30 | 4859993 |
| 31 | 5725823 |
| 32 | 6710879 |
| 33 | 7827071 |
| 34 | 9087077 |
| 35 | 10504367 |
| 36 | 12093227 |
| 37 | 13868783 |