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 | 21 |
| 2 | 91 |
| 3 | 273 |
| 4 | 651 |
| 5 | 931 |
| 6 | 1333 |
| 7 | 2451 |
| 8 | 3783 |
| 9 | 4161 |
| 10 | 4557 |
| 11 | 6643 |
| 12 | 10101 |
| 13 | 14763 |
| 14 | 20881 |
| 15 | 22351 |
| 16 | 28731 |
| 17 | 31863 |
| 18 | 38613 |
| 19 | 50851 |
| 20 | 52671 |
| 21 | 65793 |
| 22 | 83811 |
| 23 | 99541 |
| 24 | 105301 |
| 25 | 130683 |
| 26 | 139503 |
| 27 | 160401 |
| 28 | 194923 |
| 29 | 221371 |
| 30 | 234741 |
| 31 | 235711 |
| 32 | 280371 |
| 33 | 316407 |
| 34 | 332353 |
| 35 | 391251 |
| 36 | 427063 |
| 37 | 457653 |
| 38 | 532171 |
| 39 | 615441 |