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 | 9 |
| 3 | 25 |
| 4 | 63 |
| 5 | 141 |
| 6 | 283 |
| 7 | 519 |
| 8 | 885 |
| 9 | 1423 |
| 10 | 2181 |
| 11 | 3213 |
| 12 | 4579 |
| 13 | 6345 |
| 14 | 8583 |
| 15 | 11371 |
| 16 | 14793 |
| 17 | 18939 |
| 18 | 23905 |
| 19 | 29793 |
| 20 | 36711 |
| 21 | 44773 |
| 22 | 54099 |
| 23 | 64815 |
| 24 | 77053 |
| 25 | 90951 |
| 26 | 106653 |
| 27 | 124309 |
| 28 | 144075 |
| 29 | 166113 |
| 30 | 190591 |
| 31 | 217683 |
| 32 | 247569 |
| 33 | 280435 |
| 34 | 316473 |
| 35 | 355881 |
| 36 | 398863 |
| 37 | 445629 |
| 38 | 496395 |
| 39 | 551383 |
| 40 | 610821 |
| 41 | 674943 |