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) |
|---|---|
| 18 | 1 |
| 19 | 9 |
| 20 | 36 |
| 21 | 93 |
| 22 | 198 |
| 23 | 387 |
| 24 | 696 |
| 25 | 1170 |
| 26 | 1845 |
| 27 | 2740 |
| 28 | 3960 |
| 29 | 5562 |
| 30 | 7566 |
| 31 | 10125 |
| 32 | 13248 |
| 33 | 17133 |
| 34 | 22014 |
| 35 | 27774 |
| 36 | 34776 |
| 37 | 43173 |
| 38 | 53010 |
| 39 | 64869 |
| 40 | 78696 |
| 41 | 94617 |
| 42 | 113415 |
| 43 | 134946 |
| 44 | 159552 |
| 45 | 188164 |
| 46 | 219960 |
| 47 | 256041 |
| 48 | 297180 |
| 49 | 342846 |
| 50 | 394614 |
| 51 | 452595 |
| 52 | 516276 |
| 53 | 587997 |
| 54 | 667938 |
| 55 | 755109 |
| 56 | 852444 |