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) |
|---|---|
| 1 | 5 |
| 2 | 21 |
| 3 | 65 |
| 4 | 133 |
| 5 | 481 |
| 6 | 645 |
| 7 | 1541 |
| 8 | 2133 |
| 9 | 3201 |
| 10 | 3605 |
| 11 | 4033 |
| 12 | 5461 |
| 13 | 8965 |
| 14 | 12545 |
| 15 | 16725 |
| 16 | 17633 |
| 17 | 25761 |
| 18 | 31621 |
| 19 | 32865 |
| 20 | 40833 |
| 21 | 48133 |
| 22 | 52801 |
| 23 | 64533 |
| 24 | 69921 |
| 25 | 71765 |
| 26 | 79381 |
| 27 | 83333 |
| 28 | 125665 |
| 29 | 138245 |
| 30 | 151425 |
| 31 | 182533 |
| 32 | 191521 |
| 33 | 197633 |
| 34 | 226325 |
| 35 | 243105 |
| 36 | 246533 |
| 37 | 256961 |
| 38 | 260485 |
| 39 | 274821 |