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 | 0 |
| 2 | 4 |
| 3 | 15 |
| 4 | 45 |
| 5 | 116 |
| 6 | 259 |
| 7 | 505 |
| 8 | 853 |
| 9 | 1378 |
| 10 | 2256 |
| 11 | 3249 |
| 12 | 4855 |
| 13 | 6730 |
| 14 | 8738 |
| 15 | 11348 |
| 16 | 15012 |
| 17 | 19533 |
| 18 | 23693 |
| 19 | 29693 |
| 20 | 35876 |
| 21 | 41890 |
| 22 | 50691 |
| 23 | 59467 |
| 24 | 70667 |
| 25 | 84999 |
| 26 | 97916 |
| 27 | 110050 |
| 28 | 124679 |
| 29 | 138413 |
| 30 | 155289 |
| 31 | 187442 |
| 32 | 209595 |
| 33 | 236182 |
| 34 | 258438 |
| 35 | 296293 |
| 36 | 322458 |
| 37 | 358076 |
| 38 | 396409 |
| 39 | 432326 |