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 | 3 |
| 2 | 7 |
| 3 | 15 |
| 4 | 29 |
| 5 | 53 |
| 6 | 93 |
| 7 | 157 |
| 8 | 257 |
| 9 | 411 |
| 10 | 643 |
| 11 | 987 |
| 12 | 1491 |
| 13 | 2219 |
| 14 | 3259 |
| 15 | 4731 |
| 16 | 6793 |
| 17 | 9657 |
| 18 | 13605 |
| 19 | 19005 |
| 20 | 26341 |
| 21 | 36245 |
| 22 | 49533 |
| 23 | 67261 |
| 24 | 90789 |
| 25 | 121855 |
| 26 | 162679 |
| 27 | 216087 |
| 28 | 285655 |
| 29 | 375903 |
| 30 | 492527 |
| 31 | 642671 |
| 32 | 835283 |
| 33 | 1081539 |
| 34 | 1395347 |
| 35 | 1793987 |
| 36 | 2298873 |
| 37 | 2936465 |
| 38 | 3739401 |
| 39 | 4747849 |