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 | 3 |
| 1 | 9 |
| 2 | 51 |
| 3 | 255 |
| 4 | 855 |
| 5 | 2193 |
| 6 | 4719 |
| 7 | 8991 |
| 8 | 15675 |
| 9 | 25545 |
| 10 | 39483 |
| 11 | 58479 |
| 12 | 83631 |
| 13 | 116145 |
| 14 | 157335 |
| 15 | 208623 |
| 16 | 271539 |
| 17 | 347721 |
| 18 | 438915 |
| 19 | 546975 |
| 20 | 673863 |
| 21 | 821649 |
| 22 | 992511 |
| 23 | 1188735 |
| 24 | 1412715 |
| 25 | 1666953 |
| 26 | 1954059 |
| 27 | 2276751 |
| 28 | 2637855 |
| 29 | 3040305 |
| 30 | 3487143 |
| 31 | 3981519 |
| 32 | 4526691 |
| 33 | 5126025 |
| 34 | 5782995 |
| 35 | 6501183 |
| 36 | 7284279 |